From 40bcc1d3ceaa82714812e4c329afd0cb09d4ec05 Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Mon, 11 Jul 2022 08:24:47 -0500
Subject: [PATCH 01/24] setup boilerplate and tests for 6-dup

---
 .../.cargo/config.toml                        | 11 ++++
 lints/duplicate-mutable-accounts/.gitignore   |  2 +
 lints/duplicate-mutable-accounts/Cargo.toml   | 21 +++++++
 .../duplicate-mutable-accounts/rust-toolchain |  3 +
 lints/duplicate-mutable-accounts/src/lib.rs   | 56 +++++++++++++++++++
 .../ui/insecure/Cargo.toml                    | 19 +++++++
 .../ui/insecure/Xargo.toml                    |  2 +
 .../ui/insecure/src/lib.rs                    | 28 ++++++++++
 .../ui/secure/Cargo.toml                      | 19 +++++++
 .../ui/secure/Xargo.toml                      |  2 +
 .../ui/secure/src/lib.rs                      | 29 ++++++++++
 11 files changed, 192 insertions(+)
 create mode 100644 lints/duplicate-mutable-accounts/.cargo/config.toml
 create mode 100644 lints/duplicate-mutable-accounts/.gitignore
 create mode 100644 lints/duplicate-mutable-accounts/Cargo.toml
 create mode 100644 lints/duplicate-mutable-accounts/rust-toolchain
 create mode 100644 lints/duplicate-mutable-accounts/src/lib.rs
 create mode 100644 lints/duplicate-mutable-accounts/ui/insecure/Cargo.toml
 create mode 100644 lints/duplicate-mutable-accounts/ui/insecure/Xargo.toml
 create mode 100644 lints/duplicate-mutable-accounts/ui/insecure/src/lib.rs
 create mode 100644 lints/duplicate-mutable-accounts/ui/secure/Cargo.toml
 create mode 100644 lints/duplicate-mutable-accounts/ui/secure/Xargo.toml
 create mode 100644 lints/duplicate-mutable-accounts/ui/secure/src/lib.rs

diff --git a/lints/duplicate-mutable-accounts/.cargo/config.toml b/lints/duplicate-mutable-accounts/.cargo/config.toml
new file mode 100644
index 0000000..46d1571
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/.cargo/config.toml
@@ -0,0 +1,11 @@
+[target.aarch64-apple-darwin]
+linker = "dylint-link"
+
+[target.x86_64-apple-darwin]
+linker = "dylint-link"
+
+[target.x86_64-unknown-linux-gnu]
+linker = "dylint-link"
+
+[target.x86_64-pc-windows-msvc]
+linker = "dylint-link"
diff --git a/lints/duplicate-mutable-accounts/.gitignore b/lints/duplicate-mutable-accounts/.gitignore
new file mode 100644
index 0000000..4fffb2f
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/.gitignore
@@ -0,0 +1,2 @@
+/target
+/Cargo.lock
diff --git a/lints/duplicate-mutable-accounts/Cargo.toml b/lints/duplicate-mutable-accounts/Cargo.toml
new file mode 100644
index 0000000..7f446b5
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/Cargo.toml
@@ -0,0 +1,21 @@
+[package]
+name = "duplicate_mutable_accounts"
+version = "0.1.0"
+authors = ["authors go here"]
+description = "decription goes here"
+edition = "2018"
+publish = false
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+clippy_utils = { git = "https://github.com/rust-lang/rust-clippy", rev = "7b2896a8fc9f0b275692677ee6d2d66a7cbde16a" }
+dylint_linting = "2.0.1"
+if_chain = "1.0.2"
+
+[dev-dependencies]
+dylint_testing = "2.0.1"
+
+[package.metadata.rust-analyzer]
+rustc_private = true
diff --git a/lints/duplicate-mutable-accounts/rust-toolchain b/lints/duplicate-mutable-accounts/rust-toolchain
new file mode 100644
index 0000000..e348c78
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/rust-toolchain
@@ -0,0 +1,3 @@
+[toolchain]
+channel = "nightly-2022-02-24"
+components = ["llvm-tools-preview", "rustc-dev"]
diff --git a/lints/duplicate-mutable-accounts/src/lib.rs b/lints/duplicate-mutable-accounts/src/lib.rs
new file mode 100644
index 0000000..bc2e695
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/src/lib.rs
@@ -0,0 +1,56 @@
+#![feature(rustc_private)]
+#![warn(unused_extern_crates)]
+
+extern crate rustc_ast;
+extern crate rustc_ast_pretty;
+extern crate rustc_data_structures;
+extern crate rustc_errors;
+extern crate rustc_hir;
+extern crate rustc_hir_pretty;
+extern crate rustc_index;
+extern crate rustc_infer;
+extern crate rustc_lexer;
+extern crate rustc_middle;
+extern crate rustc_mir_dataflow;
+extern crate rustc_parse;
+extern crate rustc_parse_format;
+extern crate rustc_span;
+extern crate rustc_target;
+extern crate rustc_trait_selection;
+extern crate rustc_typeck;
+
+use rustc_lint::LateLintPass;
+
+dylint_linting::declare_late_lint! {
+    /// **What it does:**
+    ///
+    /// **Why is this bad?**
+    ///
+    /// **Known problems:** None.
+    ///
+    /// **Example:**
+    ///
+    /// ```rust
+    /// // example code where a warning is issued
+    /// ```
+    /// Use instead:
+    /// ```rust
+    /// // example code that does not raise a warning
+    /// ```
+    pub DUPLICATE_MUTABLE_ACCOUNTS,
+    Warn,
+    "description goes here"
+}
+
+impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
+    // A list of things you might check can be found here:
+    // https://doc.rust-lang.org/stable/nightly-rustc/rustc_lint/trait.LateLintPass.html
+}
+
+#[test]
+fn ui() {
+    dylint_testing::ui_test(
+        env!("CARGO_PKG_NAME"),
+        &std::path::Path::new(env!("CARGO_MANIFEST_DIR")).join("ui"),
+    );
+}
diff --git a/lints/duplicate-mutable-accounts/ui/insecure/Cargo.toml b/lints/duplicate-mutable-accounts/ui/insecure/Cargo.toml
new file mode 100644
index 0000000..adcf234
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/ui/insecure/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
+name = "duplicate-mutable-accounts-insecure"
+version = "0.1.0"
+description = "Created with Anchor"
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib", "lib"]
+name = "duplicate_mutable_accounts_insecure"
+
+[features]
+no-entrypoint = []
+no-idl = []
+no-log-ix-name = []
+cpi = ["no-entrypoint"]
+default = []
+
+[dependencies]
+anchor-lang = "0.20.1"
diff --git a/lints/duplicate-mutable-accounts/ui/insecure/Xargo.toml b/lints/duplicate-mutable-accounts/ui/insecure/Xargo.toml
new file mode 100644
index 0000000..475fb71
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/ui/insecure/Xargo.toml
@@ -0,0 +1,2 @@
+[target.bpfel-unknown-unknown.dependencies.std]
+features = []
diff --git a/lints/duplicate-mutable-accounts/ui/insecure/src/lib.rs b/lints/duplicate-mutable-accounts/ui/insecure/src/lib.rs
new file mode 100644
index 0000000..0427589
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/ui/insecure/src/lib.rs
@@ -0,0 +1,28 @@
+use anchor_lang::prelude::*;
+
+declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
+
+#[program]
+pub mod duplicate_mutable_accounts_insecure {
+    use super::*;
+
+    pub fn update(ctx: Context<Update>, a: u64, b: u64) -> ProgramResult {
+        let user_a = &mut ctx.accounts.user_a;
+        let user_b = &mut ctx.accounts.user_b;
+
+        user_a.data = a;
+        user_b.data = b;
+        Ok(())
+    }
+}
+
+#[derive(Accounts)]
+pub struct Update<'info> {
+    user_a: Account<'info, User>,
+    user_b: Account<'info, User>,
+}
+
+#[account]
+pub struct User {
+    data: u64,
+}
diff --git a/lints/duplicate-mutable-accounts/ui/secure/Cargo.toml b/lints/duplicate-mutable-accounts/ui/secure/Cargo.toml
new file mode 100644
index 0000000..43d63ca
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/ui/secure/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
+name = "duplicate-mutable-accounts-secure"
+version = "0.1.0"
+description = "Created with Anchor"
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib", "lib"]
+name = "duplicate_mutable_accounts_secure"
+
+[features]
+no-entrypoint = []
+no-idl = []
+no-log-ix-name = []
+cpi = ["no-entrypoint"]
+default = []
+
+[dependencies]
+anchor-lang = "0.20.1"
diff --git a/lints/duplicate-mutable-accounts/ui/secure/Xargo.toml b/lints/duplicate-mutable-accounts/ui/secure/Xargo.toml
new file mode 100644
index 0000000..475fb71
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/ui/secure/Xargo.toml
@@ -0,0 +1,2 @@
+[target.bpfel-unknown-unknown.dependencies.std]
+features = []
diff --git a/lints/duplicate-mutable-accounts/ui/secure/src/lib.rs b/lints/duplicate-mutable-accounts/ui/secure/src/lib.rs
new file mode 100644
index 0000000..d98454f
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/ui/secure/src/lib.rs
@@ -0,0 +1,29 @@
+use anchor_lang::prelude::*;
+
+declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
+
+#[program]
+pub mod duplicate_mutable_accounts_secure {
+    use super::*;
+
+    pub fn update_secure(ctx: Context<Update>, a: u64, b: u64) -> ProgramResult {
+        let user_a = &mut ctx.accounts.user_a;
+        let user_b = &mut ctx.accounts.user_b;
+
+        user_a.data = a;
+        user_b.data = b;
+        Ok(())
+    }
+}
+
+#[derive(Accounts)]
+pub struct Update<'info> {
+    #[account(constraint = user_a.key() != user_b.key())]
+    user_a: Account<'info, User>,
+    user_b: Account<'info, User>,
+}
+
+#[account]
+pub struct User {
+    data: u64,
+}

From dc1242feb3b0750df149733dd167524ad884ec0c Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Mon, 11 Jul 2022 11:26:38 -0500
Subject: [PATCH 02/24] implement 6-duplicate-mutable-accounts lint

---
 lints/duplicate-mutable-accounts/Cargo.toml   |   12 +
 lints/duplicate-mutable-accounts/src/lib.rs   |  164 +-
 .../ui/insecure/Cargo.lock                    | 1315 +++++++++++++++++
 .../ui/insecure/Cargo.toml                    |    4 +-
 .../ui/insecure/src/lib.rs                    |    8 +-
 .../ui/insecure/src/lib.stderr                |   15 +
 .../ui/secure/Cargo.lock                      | 1315 +++++++++++++++++
 .../ui/secure/Cargo.toml                      |    4 +-
 .../ui/secure/src/lib.rs                      |    8 +-
 .../ui/secure/src/lib.stderr                  |    0
 10 files changed, 2817 insertions(+), 28 deletions(-)
 create mode 100644 lints/duplicate-mutable-accounts/ui/insecure/Cargo.lock
 create mode 100644 lints/duplicate-mutable-accounts/ui/insecure/src/lib.stderr
 create mode 100644 lints/duplicate-mutable-accounts/ui/secure/Cargo.lock
 create mode 100644 lints/duplicate-mutable-accounts/ui/secure/src/lib.stderr

diff --git a/lints/duplicate-mutable-accounts/Cargo.toml b/lints/duplicate-mutable-accounts/Cargo.toml
index 7f446b5..64ad973 100644
--- a/lints/duplicate-mutable-accounts/Cargo.toml
+++ b/lints/duplicate-mutable-accounts/Cargo.toml
@@ -9,13 +9,25 @@ publish = false
 [lib]
 crate-type = ["cdylib"]
 
+[[example]]
+name = "insecure"
+path = "ui/insecure/src/lib.rs"
+
+[[example]]
+name = "secure"
+path = "ui/secure/src/lib.rs"
+
 [dependencies]
 clippy_utils = { git = "https://github.com/rust-lang/rust-clippy", rev = "7b2896a8fc9f0b275692677ee6d2d66a7cbde16a" }
 dylint_linting = "2.0.1"
 if_chain = "1.0.2"
+solana-lints = { path = "../../crate" }
 
 [dev-dependencies]
 dylint_testing = "2.0.1"
+anchor-lang = "0.24.2"
+
+[workspace]
 
 [package.metadata.rust-analyzer]
 rustc_private = true
diff --git a/lints/duplicate-mutable-accounts/src/lib.rs b/lints/duplicate-mutable-accounts/src/lib.rs
index bc2e695..1613aea 100644
--- a/lints/duplicate-mutable-accounts/src/lib.rs
+++ b/lints/duplicate-mutable-accounts/src/lib.rs
@@ -2,26 +2,26 @@
 #![warn(unused_extern_crates)]
 
 extern crate rustc_ast;
-extern crate rustc_ast_pretty;
-extern crate rustc_data_structures;
-extern crate rustc_errors;
 extern crate rustc_hir;
-extern crate rustc_hir_pretty;
-extern crate rustc_index;
-extern crate rustc_infer;
-extern crate rustc_lexer;
-extern crate rustc_middle;
-extern crate rustc_mir_dataflow;
-extern crate rustc_parse;
-extern crate rustc_parse_format;
 extern crate rustc_span;
-extern crate rustc_target;
-extern crate rustc_trait_selection;
-extern crate rustc_typeck;
 
-use rustc_lint::LateLintPass;
+use rustc_ast::{
+    token::TokenKind,
+    tokenstream::{TokenStream, TokenTree},
+    AttrKind, Attribute, MacArgs,
+};
+use rustc_hir::def::Res;
+use rustc_hir::*;
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_span::{def_id::DefId, symbol::Symbol, Span};
+use std::collections::HashMap;
+use std::default::Default;
 
-dylint_linting::declare_late_lint! {
+use clippy_utils::{diagnostics::span_lint_and_help, ty::match_type};
+use if_chain::if_chain;
+use solana_lints::paths;
+
+dylint_linting::impl_late_lint! {
     /// **What it does:**
     ///
     /// **Why is this bad?**
@@ -39,18 +39,134 @@ dylint_linting::declare_late_lint! {
     /// ```
     pub DUPLICATE_MUTABLE_ACCOUNTS,
     Warn,
-    "description goes here"
+    "description goes here",
+    DuplicateMutableAccounts::default()
+}
+
+#[derive(Default, Debug)]
+struct DuplicateMutableAccounts {
+    accounts: HashMap<DefId, Vec<(Symbol, Span)>>,
+    streams: Vec<Stream>,
 }
 
 impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
-    // A list of things you might check can be found here:
-    // https://doc.rust-lang.org/stable/nightly-rustc/rustc_lint/trait.LateLintPass.html
+    fn check_struct_def(&mut self, cx: &LateContext<'tcx>, variant_data: &'tcx VariantData<'tcx>) {
+        if let VariantData::Struct(fields, _) = variant_data {
+            fields.iter().for_each(|field| {
+                if_chain! {
+                    // grab the def_id of the field type
+                    let ty = field.ty;
+                    if let TyKind::Path(qpath) = &ty.kind;
+                    if let QPath::Resolved(_, path) = qpath;
+                    if let Res::Def(_, def_id) = path.res;
+                    // match the type of the field
+                    let ty = cx.tcx.type_of(def_id);
+                    // check it is an anchor account type
+                    if match_type(cx, ty, &paths::ANCHOR_ACCOUNT);
+                    // check the type of T, the second generic arg
+                    let account_id = get_anchor_account_type(&path.segments[0]).unwrap();
+                    then {
+                        if let Some(v) = self.accounts.get_mut(&account_id) {
+                            v.push((field.ident.name, field.span));
+                        } else {
+                            self.accounts.insert(account_id, vec![(field.ident.name, field.span)]);
+                        }
+                    }
+                }
+            });
+        }
+    }
+
+    fn check_attribute(&mut self, _: &LateContext<'tcx>, attribute: &'tcx Attribute) {
+        // println!("{:#?}", self.accounts);
+        if_chain! {
+            if let AttrKind::Normal(attr_item, _) = &attribute.kind;
+            let name = attr_item.path.segments[0].ident.name;
+            // for some reason #[account] doesn't match when no args, maybe take away
+            // the code to check name, and just check it has constraint args?
+            if name.as_str() == "account";
+            if let MacArgs::Delimited(_, _, token_stream) = &attr_item.args;
+            then {
+                self.streams.push(Stream(token_stream.clone()));
+                // println!("{:#?}", attribute);
+            }
+        }
+    }
+
+    fn check_crate_post(&mut self, cx: &LateContext<'tcx>) {
+        // println!("{:#?}", self);
+        for (_k, v) in self.accounts.iter() {
+            // if multiple same accounts, check that there is a tokenstream such that
+            // all necessary expressions are in it: x.key(), y.key(), !=
+            // where x and y are the field name from self.accounts
+            if v.len() > 1 {
+                if !has_satisfying_stream(&self.streams, v) {
+                    span_lint_and_help(
+                        cx,
+                        DUPLICATE_MUTABLE_ACCOUNTS,
+                        v[0].1,
+                        "identical account types",
+                        Some(v[1].1),
+                        &format!("add an anchor key check constraint: #[account(constraint = {}.key() != {}.key())]", v[0].0, v[1].0)
+                    );
+                }
+            }
+        }
+    }
+}
+
+fn get_anchor_account_type(segment: &PathSegment<'_>) -> Option<DefId> {
+    if_chain! {
+        if let Some(generic_args) = segment.args;
+        if let GenericArg::Type(ty) = &generic_args.args[1]; // the account type is the second generic arg
+        if let TyKind::Path(qpath) = &ty.kind;
+        if let QPath::Resolved(_, path) = qpath;
+        if let Res::Def(_, def_id) = path.res;
+        then {
+            Some(def_id)
+        } else {
+            None
+        }
+    }
+}
+
+fn has_satisfying_stream(streams: &Vec<Stream>, field_names: &Vec<(Symbol, Span)>) -> bool {
+    for stream in streams {
+        if stream.contains(TokenKind::Ne)
+            && field_names
+                .iter()
+                // TODO: if true, will not match. figure out what the bool signifies
+                .all(|(sym, _)| stream.contains(TokenKind::Ident(*sym, false)))
+        {
+            return true;
+        }
+    }
+    return false;
+}
+
+#[derive(Debug)]
+pub struct Stream(TokenStream);
+
+impl Stream {
+    fn contains(&self, x: TokenKind) -> bool {
+        for token_tree in self.0.trees() {
+            if let TokenTree::Token(t) = token_tree {
+                if t.kind == x {
+                    // println!("The type {:?} matches {:?}", t.kind, x);
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+}
+
+#[test]
+fn insecure() {
+    dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "insecure");
 }
 
 #[test]
-fn ui() {
-    dylint_testing::ui_test(
-        env!("CARGO_PKG_NAME"),
-        &std::path::Path::new(env!("CARGO_MANIFEST_DIR")).join("ui"),
-    );
+fn secure() {
+    dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "secure");
 }
diff --git a/lints/duplicate-mutable-accounts/ui/insecure/Cargo.lock b/lints/duplicate-mutable-accounts/ui/insecure/Cargo.lock
new file mode 100644
index 0000000..9cb8d20
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/ui/insecure/Cargo.lock
@@ -0,0 +1,1315 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "ahash"
+version = "0.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fcb51a0695d8f838b1ee009b3fbf66bda078cd64590202a864a8f3e8c4315c47"
+dependencies = [
+ "getrandom 0.2.7",
+ "once_cell",
+ "version_check",
+]
+
+[[package]]
+name = "aho-corasick"
+version = "0.7.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e37cfd5e7657ada45f742d6e99ca5788580b5c529dc78faf11ece6dc702656f"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "anchor-attribute-access-control"
+version = "0.24.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a9b75d05b6b4ac9d95bb6e3b786b27d3a708c4c5a87c92ffaa25bbe9ae4c5d91"
+dependencies = [
+ "anchor-syn",
+ "anyhow",
+ "proc-macro2",
+ "quote",
+ "regex",
+ "syn",
+]
+
+[[package]]
+name = "anchor-attribute-account"
+version = "0.24.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "485351a6d8157750d10d88c8e256f1bf8339262b2220ae9125aed3471309b5de"
+dependencies = [
+ "anchor-syn",
+ "anyhow",
+ "bs58 0.4.0",
+ "proc-macro2",
+ "quote",
+ "rustversion",
+ "syn",
+]
+
+[[package]]
+name = "anchor-attribute-constant"
+version = "0.24.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc632c540913dd051a78b00587cc47f57013d303163ddfaf4fa18717f7ccc1e0"
+dependencies = [
+ "anchor-syn",
+ "proc-macro2",
+ "syn",
+]
+
+[[package]]
+name = "anchor-attribute-error"
+version = "0.24.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3b5bd1dcfa7f3bc22dacef233d70a9e0bee269c4ac484510662f257cba2353a1"
+dependencies = [
+ "anchor-syn",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "anchor-attribute-event"
+version = "0.24.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c6f9e6ce551ac9a177a45c99a65699a860c9e95fac68675138af1246e2591b0"
+dependencies = [
+ "anchor-syn",
+ "anyhow",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
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+
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+
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diff --git a/lints/duplicate-mutable-accounts/ui/insecure/Cargo.toml b/lints/duplicate-mutable-accounts/ui/insecure/Cargo.toml
index adcf234..8ade494 100644
--- a/lints/duplicate-mutable-accounts/ui/insecure/Cargo.toml
+++ b/lints/duplicate-mutable-accounts/ui/insecure/Cargo.toml
@@ -15,5 +15,7 @@ no-log-ix-name = []
 cpi = ["no-entrypoint"]
 default = []
 
+[workspace]
+
 [dependencies]
-anchor-lang = "0.20.1"
+anchor-lang = "0.24.2"
diff --git a/lints/duplicate-mutable-accounts/ui/insecure/src/lib.rs b/lints/duplicate-mutable-accounts/ui/insecure/src/lib.rs
index 0427589..2e1d708 100644
--- a/lints/duplicate-mutable-accounts/ui/insecure/src/lib.rs
+++ b/lints/duplicate-mutable-accounts/ui/insecure/src/lib.rs
@@ -6,7 +6,11 @@ declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
 pub mod duplicate_mutable_accounts_insecure {
     use super::*;
 
-    pub fn update(ctx: Context<Update>, a: u64, b: u64) -> ProgramResult {
+    pub fn update(
+        ctx: Context<Update>,
+        a: u64,
+        b: u64,
+    ) -> anchor_lang::solana_program::entrypoint::ProgramResult {
         let user_a = &mut ctx.accounts.user_a;
         let user_b = &mut ctx.accounts.user_b;
 
@@ -26,3 +30,5 @@ pub struct Update<'info> {
 pub struct User {
     data: u64,
 }
+
+fn main() {}
diff --git a/lints/duplicate-mutable-accounts/ui/insecure/src/lib.stderr b/lints/duplicate-mutable-accounts/ui/insecure/src/lib.stderr
new file mode 100644
index 0000000..48cda15
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/ui/insecure/src/lib.stderr
@@ -0,0 +1,15 @@
+error: identical account types
+  --> $DIR/lib.rs:25:5
+   |
+LL |     user_a: Account<'info, User>,
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `-D duplicate-mutable-accounts` implied by `-D warnings`
+help: add an anchor key check constraint: #[account(constraint = user_a.key() != user_b.key())]
+  --> $DIR/lib.rs:26:5
+   |
+LL |     user_b: Account<'info, User>,
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+
diff --git a/lints/duplicate-mutable-accounts/ui/secure/Cargo.lock b/lints/duplicate-mutable-accounts/ui/secure/Cargo.lock
new file mode 100644
index 0000000..ad9c1fd
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/ui/secure/Cargo.lock
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+checksum = "bd829fe32373d27f76265620b5309d0340cb8550f523c1dda251d6298069069a"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0396bc89e626244658bef819e22d0cc459e795a5ebe878e6ec336d1674a8d79a"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "toml"
+version = "0.5.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8d82e1a7758622a465f8cee077614c73484dac5b836c02ff6a40d5d1010324d7"
+dependencies = [
+ "serde",
+]
+
+[[package]]
+name = "typenum"
+version = "1.15.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dcf81ac59edc17cc8697ff311e8f5ef2d99fcbd9817b34cec66f90b6c3dfd987"
+
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+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5bd2fe26506023ed7b5e1e315add59d6f584c621d037f9368fea9cfb988f368c"
+
+[[package]]
+name = "unicode-segmentation"
+version = "1.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7e8820f5d777f6224dc4be3632222971ac30164d4a258d595640799554ebfd99"
+
+[[package]]
+name = "version_check"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
+
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+
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+version = "0.2.81"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7c53b543413a17a202f4be280a7e5c62a1c69345f5de525ee64f8cfdbc954994"
+dependencies = [
+ "cfg-if",
+ "wasm-bindgen-macro",
+]
+
+[[package]]
+name = "wasm-bindgen-backend"
+version = "0.2.81"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5491a68ab4500fa6b4d726bd67408630c3dbe9c4fe7bda16d5c82a1fd8c7340a"
+dependencies = [
+ "bumpalo",
+ "lazy_static",
+ "log",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-macro"
+version = "0.2.81"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c441e177922bc58f1e12c022624b6216378e5febc2f0533e41ba443d505b80aa"
+dependencies = [
+ "quote",
+ "wasm-bindgen-macro-support",
+]
+
+[[package]]
+name = "wasm-bindgen-macro-support"
+version = "0.2.81"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7d94ac45fcf608c1f45ef53e748d35660f168490c10b23704c7779ab8f5c3048"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-backend",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.81"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a89911bd99e5f3659ec4acf9c4d93b0a90fe4a2a11f15328472058edc5261be"
+
+[[package]]
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+version = "0.3.58"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2fed94beee57daf8dd7d51f2b15dc2bcde92d7a72304cdf662a4371008b71b90"
+dependencies = [
+ "js-sys",
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "yansi"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09041cd90cf85f7f8b2df60c646f853b7f535ce68f85244eb6731cf89fa498ec"
+
+[[package]]
+name = "zeroize"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4756f7db3f7b5574938c3eb1c117038b8e07f95ee6718c0efad4ac21508f1efd"
diff --git a/lints/duplicate-mutable-accounts/ui/secure/Cargo.toml b/lints/duplicate-mutable-accounts/ui/secure/Cargo.toml
index 43d63ca..b32565c 100644
--- a/lints/duplicate-mutable-accounts/ui/secure/Cargo.toml
+++ b/lints/duplicate-mutable-accounts/ui/secure/Cargo.toml
@@ -15,5 +15,7 @@ no-log-ix-name = []
 cpi = ["no-entrypoint"]
 default = []
 
+[workspace]
+
 [dependencies]
-anchor-lang = "0.20.1"
+anchor-lang = "0.24.2"
diff --git a/lints/duplicate-mutable-accounts/ui/secure/src/lib.rs b/lints/duplicate-mutable-accounts/ui/secure/src/lib.rs
index d98454f..12924e1 100644
--- a/lints/duplicate-mutable-accounts/ui/secure/src/lib.rs
+++ b/lints/duplicate-mutable-accounts/ui/secure/src/lib.rs
@@ -6,7 +6,11 @@ declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
 pub mod duplicate_mutable_accounts_secure {
     use super::*;
 
-    pub fn update_secure(ctx: Context<Update>, a: u64, b: u64) -> ProgramResult {
+    pub fn update_secure(
+        ctx: Context<Update>,
+        a: u64,
+        b: u64,
+    ) -> anchor_lang::solana_program::entrypoint::ProgramResult {
         let user_a = &mut ctx.accounts.user_a;
         let user_b = &mut ctx.accounts.user_b;
 
@@ -27,3 +31,5 @@ pub struct Update<'info> {
 pub struct User {
     data: u64,
 }
+
+fn main() {}
diff --git a/lints/duplicate-mutable-accounts/ui/secure/src/lib.stderr b/lints/duplicate-mutable-accounts/ui/secure/src/lib.stderr
new file mode 100644
index 0000000..e69de29

From f012a325212df7e1a0c04accbeadcd0ed3372a85 Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Thu, 14 Jul 2022 11:03:33 -0500
Subject: [PATCH 03/24] drafting of upgrade

---
 lints/duplicate-mutable-accounts/Cargo.toml   |    6 +
 lints/duplicate-mutable-accounts/src/lib.rs   |  122 +-
 .../ui/insecure-2/Cargo.lock                  | 1315 +++++++++++++++++
 .../ui/insecure-2/Cargo.toml                  |   21 +
 .../ui/insecure-2/Xargo.toml                  |    2 +
 .../ui/insecure-2/src/lib.rs                  |   37 +
 .../ui/insecure-2/src/lib.stderr              |   15 +
 .../ui/secure/src/lib.rs                      |    6 +-
 8 files changed, 1480 insertions(+), 44 deletions(-)
 create mode 100644 lints/duplicate-mutable-accounts/ui/insecure-2/Cargo.lock
 create mode 100644 lints/duplicate-mutable-accounts/ui/insecure-2/Cargo.toml
 create mode 100644 lints/duplicate-mutable-accounts/ui/insecure-2/Xargo.toml
 create mode 100644 lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.rs
 create mode 100644 lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.stderr

diff --git a/lints/duplicate-mutable-accounts/Cargo.toml b/lints/duplicate-mutable-accounts/Cargo.toml
index 64ad973..4acd5ce 100644
--- a/lints/duplicate-mutable-accounts/Cargo.toml
+++ b/lints/duplicate-mutable-accounts/Cargo.toml
@@ -13,6 +13,10 @@ crate-type = ["cdylib"]
 name = "insecure"
 path = "ui/insecure/src/lib.rs"
 
+[[example]]
+name = "insecure-2"
+path = "ui/insecure-2/src/lib.rs"
+
 [[example]]
 name = "secure"
 path = "ui/secure/src/lib.rs"
@@ -21,6 +25,8 @@ path = "ui/secure/src/lib.rs"
 clippy_utils = { git = "https://github.com/rust-lang/rust-clippy", rev = "7b2896a8fc9f0b275692677ee6d2d66a7cbde16a" }
 dylint_linting = "2.0.1"
 if_chain = "1.0.2"
+proc-macro2 = "1.0.40"
+quote = "1.0.20"
 solana-lints = { path = "../../crate" }
 
 [dev-dependencies]
diff --git a/lints/duplicate-mutable-accounts/src/lib.rs b/lints/duplicate-mutable-accounts/src/lib.rs
index 1613aea..1667e23 100644
--- a/lints/duplicate-mutable-accounts/src/lib.rs
+++ b/lints/duplicate-mutable-accounts/src/lib.rs
@@ -5,6 +5,10 @@ extern crate rustc_ast;
 extern crate rustc_hir;
 extern crate rustc_span;
 
+use proc_macro2::*;
+use quote::quote;
+use std::str::FromStr;
+
 use rustc_ast::{
     token::TokenKind,
     tokenstream::{TokenStream, TokenTree},
@@ -14,7 +18,7 @@ use rustc_hir::def::Res;
 use rustc_hir::*;
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_span::{def_id::DefId, symbol::Symbol, Span};
-use std::collections::HashMap;
+use std::collections::{HashMap, HashSet, VecDeque};
 use std::default::Default;
 
 use clippy_utils::{diagnostics::span_lint_and_help, ty::match_type};
@@ -46,7 +50,7 @@ dylint_linting::impl_late_lint! {
 #[derive(Default, Debug)]
 struct DuplicateMutableAccounts {
     accounts: HashMap<DefId, Vec<(Symbol, Span)>>,
-    streams: Vec<Stream>,
+    streams: Streams,
 }
 
 impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
@@ -81,13 +85,16 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
         // println!("{:#?}", self.accounts);
         if_chain! {
             if let AttrKind::Normal(attr_item, _) = &attribute.kind;
-            let name = attr_item.path.segments[0].ident.name;
+            let name = attr_item.path.segments[0].ident.name; // TODO: can use name_or_empty
             // for some reason #[account] doesn't match when no args, maybe take away
             // the code to check name, and just check it has constraint args?
             if name.as_str() == "account";
             if let MacArgs::Delimited(_, _, token_stream) = &attr_item.args;
             then {
-                self.streams.push(Stream(token_stream.clone()));
+                // TODO: figure out stream representation. At this point, may parse?
+                // TODO: filter mechanism: only insert constraints that match form "constraint = _.key() != _.key()"
+                // TODO: may need to parse each constraint as a separate stream, as comma-delimited
+                self.streams.0.push(token_stream.clone());
                 // println!("{:#?}", attribute);
             }
         }
@@ -96,19 +103,22 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
     fn check_crate_post(&mut self, cx: &LateContext<'tcx>) {
         // println!("{:#?}", self);
         for (_k, v) in self.accounts.iter() {
-            // if multiple same accounts, check that there is a tokenstream such that
-            // all necessary expressions are in it: x.key(), y.key(), !=
-            // where x and y are the field name from self.accounts
             if v.len() > 1 {
-                if !has_satisfying_stream(&self.streams, v) {
-                    span_lint_and_help(
-                        cx,
-                        DUPLICATE_MUTABLE_ACCOUNTS,
-                        v[0].1,
-                        "identical account types",
-                        Some(v[1].1),
-                        &format!("add an anchor key check constraint: #[account(constraint = {}.key() != {}.key())]", v[0].0, v[1].0)
-                    );
+                // generate static set of possible constraints
+                let gen_constraints = generate_possible_expected_constraints(v);
+
+                // assert the following checks:
+                for (one, reflexive) in gen_constraints {
+                    if !(self.streams.contains(one) || self.streams.contains(reflexive)) {
+                        //     span_lint_and_help(
+                        //         cx,
+                        //         DUPLICATE_MUTABLE_ACCOUNTS,
+                        //         v[0].1,
+                        //         "identical account types",
+                        //         Some(v[1].1),
+                        //         &format!("add an anchor key check constraint: #[account(constraint = {}.key() != {}.key())]", v[0].0, v[1].0)
+                        //     );
+                    }
                 }
             }
         }
@@ -117,6 +127,7 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
 
 fn get_anchor_account_type(segment: &PathSegment<'_>) -> Option<DefId> {
     if_chain! {
+        // TODO: the following logic to get def_id is a repeated pattern
         if let Some(generic_args) = segment.args;
         if let GenericArg::Type(ty) = &generic_args.args[1]; // the account type is the second generic arg
         if let TyKind::Path(qpath) = &ty.kind;
@@ -130,34 +141,38 @@ fn get_anchor_account_type(segment: &PathSegment<'_>) -> Option<DefId> {
     }
 }
 
-fn has_satisfying_stream(streams: &Vec<Stream>, field_names: &Vec<(Symbol, Span)>) -> bool {
-    for stream in streams {
-        if stream.contains(TokenKind::Ne)
-            && field_names
-                .iter()
-                // TODO: if true, will not match. figure out what the bool signifies
-                .all(|(sym, _)| stream.contains(TokenKind::Ident(*sym, false)))
-        {
-            return true;
+/// Generates a static set of a possible expected key check constraints necessary for `values`.
+fn generate_possible_expected_constraints(values: &Vec<(Symbol, Span)>) -> Vec<(proc_macro2::TokenStream, proc_macro2::TokenStream)> {
+    // TODO: may start with a VecDeque in the first place?
+    let mut deq = VecDeque::from(values.clone());
+    let mut gen_set = Vec::new();
+
+    for _ in 0..deq.len() - 1 {
+        let first = deq.pop_front().unwrap().0;
+        // generate stream for all other values in vec
+        for (other, _) in &deq {
+            let constraint = format!("constraint = {}.key() != {}.key()", first.as_str(), other.as_str());
+            let reflexive = format!("constraint = {}.key() != {}.key()", other.as_str(), first.as_str());      
+
+            // using quote
+            // let stream = quote!(constraint = first.as_str().key() != other.as_str().key());
+
+            let stream: proc_macro2::TokenStream = constraint.parse().unwrap();
+            let reflex_stream: proc_macro2::TokenStream = reflexive.parse().unwrap();
+            // println!("{:#?}", stream);
+
+            gen_set.push((stream, reflex_stream));
         }
     }
-    return false;
+    gen_set
 }
 
-#[derive(Debug)]
-pub struct Stream(TokenStream);
+#[derive(Debug, Default)]
+pub struct Streams(Vec<TokenStream>);
 
-impl Stream {
-    fn contains(&self, x: TokenKind) -> bool {
-        for token_tree in self.0.trees() {
-            if let TokenTree::Token(t) = token_tree {
-                if t.kind == x {
-                    // println!("The type {:?} matches {:?}", t.kind, x);
-                    return true;
-                }
-            }
-        }
-        return false;
+impl Streams {
+    fn contains(&self, other: TokenStream) -> bool {
+        self.0.iter().any(|stream| stream == &other)
     }
 }
 
@@ -166,7 +181,36 @@ fn insecure() {
     dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "insecure");
 }
 
+#[test]
+fn insecure_2() {
+    dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "insecure-2");
+}
+
 #[test]
 fn secure() {
     dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "secure");
 }
+
+// fn has_satisfying_stream(streams: &Vec<Stream>, field_names: &Vec<(Symbol, Span)>) -> bool {
+//     for stream in streams {
+//         if stream.contains(TokenKind::Ne)
+//             && field_names
+//                 .iter()
+//                 // TODO: if true, will not match. figure out what the bool signifies
+//                 .all(|(sym, _)| stream.contains(TokenKind::Ident(*sym, false)))
+//         {
+//             return true;
+//         }
+//     }
+//     return false;
+// }
+
+// Generates a TokenStream that matches `constraint = a.key() != b.key()` and its reflexive
+// fn generate_key_check_constraint(a: Symbol, b: Symbol) -> (TokenStream, TokenStream) {
+//     let mut tree_and_spacing = vec![];
+//     // create token
+//     let tree = TokenTree::token(TokenKind::Ident(Symbol::intern("constraint"), false), span); // TODO: generate span somehow
+//     tree_and_spacing.push(TreeAndSpacing::from(tree));
+
+//     TokenStream::new(tree_and_spacing)
+// }
diff --git a/lints/duplicate-mutable-accounts/ui/insecure-2/Cargo.lock b/lints/duplicate-mutable-accounts/ui/insecure-2/Cargo.lock
new file mode 100644
index 0000000..9cb8d20
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/ui/insecure-2/Cargo.lock
@@ -0,0 +1,1315 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "ahash"
+version = "0.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "getrandom 0.2.7",
+ "once_cell",
+ "version_check",
+]
+
+[[package]]
+name = "aho-corasick"
+version = "0.7.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e37cfd5e7657ada45f742d6e99ca5788580b5c529dc78faf11ece6dc702656f"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "anchor-attribute-access-control"
+version = "0.24.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a9b75d05b6b4ac9d95bb6e3b786b27d3a708c4c5a87c92ffaa25bbe9ae4c5d91"
+dependencies = [
+ "anchor-syn",
+ "anyhow",
+ "proc-macro2",
+ "quote",
+ "regex",
+ "syn",
+]
+
+[[package]]
+name = "anchor-attribute-account"
+version = "0.24.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "anchor-syn",
+ "anyhow",
+ "bs58 0.4.0",
+ "proc-macro2",
+ "quote",
+ "rustversion",
+ "syn",
+]
+
+[[package]]
+name = "anchor-attribute-constant"
+version = "0.24.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "anchor-syn",
+ "proc-macro2",
+ "syn",
+]
+
+[[package]]
+name = "anchor-attribute-error"
+version = "0.24.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3b5bd1dcfa7f3bc22dacef233d70a9e0bee269c4ac484510662f257cba2353a1"
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+ "anchor-syn",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
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+[[package]]
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+dependencies = [
+ "anchor-syn",
+ "anyhow",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
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+version = "0.24.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+ "anchor-syn",
+ "anyhow",
+ "heck",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
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+ "anchor-syn",
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diff --git a/lints/duplicate-mutable-accounts/ui/insecure-2/Cargo.toml b/lints/duplicate-mutable-accounts/ui/insecure-2/Cargo.toml
new file mode 100644
index 0000000..e0b71e3
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+++ b/lints/duplicate-mutable-accounts/ui/insecure-2/Cargo.toml
@@ -0,0 +1,21 @@
+[package]
+name = "duplicate-mutable-accounts-insecure-2"
+version = "0.1.0"
+description = "Created with Anchor"
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib", "lib"]
+name = "duplicate_mutable_accounts_insecure_2"
+
+[features]
+no-entrypoint = []
+no-idl = []
+no-log-ix-name = []
+cpi = ["no-entrypoint"]
+default = []
+
+[workspace]
+
+[dependencies]
+anchor-lang = "0.24.2"
diff --git a/lints/duplicate-mutable-accounts/ui/insecure-2/Xargo.toml b/lints/duplicate-mutable-accounts/ui/insecure-2/Xargo.toml
new file mode 100644
index 0000000..475fb71
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/ui/insecure-2/Xargo.toml
@@ -0,0 +1,2 @@
+[target.bpfel-unknown-unknown.dependencies.std]
+features = []
diff --git a/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.rs b/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.rs
new file mode 100644
index 0000000..4324688
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.rs
@@ -0,0 +1,37 @@
+use anchor_lang::prelude::*;
+
+declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
+
+#[program]
+pub mod duplicate_mutable_accounts_insecure {
+    use super::*;
+
+    pub fn update(
+        ctx: Context<Update>,
+        a: u64,
+        b: u64,
+    ) -> anchor_lang::solana_program::entrypoint::ProgramResult {
+        let user_a = &mut ctx.accounts.user_a;
+        let user_b = &mut ctx.accounts.user_b;
+
+        user_a.data = a;
+        user_b.data = b;
+        Ok(())
+    }
+}
+
+#[derive(Accounts)]
+pub struct Update<'info> {
+    #[account(constraint = user_a.key() != user_b.key())]
+    user_a: Account<'info, User>,
+    #[account(constraint = user_c.key() != user_b.key())]
+    user_b: Account<'info, User>,
+    user_c: Account<'info, User>,
+}
+
+#[account]
+pub struct User {
+    data: u64,
+}
+
+fn main() {}
diff --git a/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.stderr b/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.stderr
new file mode 100644
index 0000000..48cda15
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.stderr
@@ -0,0 +1,15 @@
+error: identical account types
+  --> $DIR/lib.rs:25:5
+   |
+LL |     user_a: Account<'info, User>,
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `-D duplicate-mutable-accounts` implied by `-D warnings`
+help: add an anchor key check constraint: #[account(constraint = user_a.key() != user_b.key())]
+  --> $DIR/lib.rs:26:5
+   |
+LL |     user_b: Account<'info, User>,
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+
diff --git a/lints/duplicate-mutable-accounts/ui/secure/src/lib.rs b/lints/duplicate-mutable-accounts/ui/secure/src/lib.rs
index 12924e1..df1057d 100644
--- a/lints/duplicate-mutable-accounts/ui/secure/src/lib.rs
+++ b/lints/duplicate-mutable-accounts/ui/secure/src/lib.rs
@@ -6,11 +6,7 @@ declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
 pub mod duplicate_mutable_accounts_secure {
     use super::*;
 
-    pub fn update_secure(
-        ctx: Context<Update>,
-        a: u64,
-        b: u64,
-    ) -> anchor_lang::solana_program::entrypoint::ProgramResult {
+    pub fn update_secure(ctx: Context<Update>, a: u64, b: u64) -> anchor_lang::solana_program::entrypoint::ProgramResult {
         let user_a = &mut ctx.accounts.user_a;
         let user_b = &mut ctx.accounts.user_b;
 

From e9cd6d2dcc7913bb928df1d97d411594fb7c90f6 Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Sat, 16 Jul 2022 08:17:33 -0500
Subject: [PATCH 04/24] complete working impl of lint-6 for anchor constraint
 checks

---
 lints/duplicate-mutable-accounts/Cargo.toml   |   2 +-
 .../duplicate-mutable-accounts/rust-toolchain |   2 +-
 lints/duplicate-mutable-accounts/src/lib.rs   | 177 ++++++++++++------
 .../ui/insecure-2/src/lib.rs                  |   3 +-
 .../ui/secure/src/lib.rs                      |   6 +-
 5 files changed, 126 insertions(+), 64 deletions(-)

diff --git a/lints/duplicate-mutable-accounts/Cargo.toml b/lints/duplicate-mutable-accounts/Cargo.toml
index 4acd5ce..b8aff35 100644
--- a/lints/duplicate-mutable-accounts/Cargo.toml
+++ b/lints/duplicate-mutable-accounts/Cargo.toml
@@ -22,7 +22,7 @@ name = "secure"
 path = "ui/secure/src/lib.rs"
 
 [dependencies]
-clippy_utils = { git = "https://github.com/rust-lang/rust-clippy", rev = "7b2896a8fc9f0b275692677ee6d2d66a7cbde16a" }
+clippy_utils = { git = "https://github.com/rust-lang/rust-clippy", rev = "0cb0f7636851f9fcc57085cf80197a2ef6db098f" }
 dylint_linting = "2.0.1"
 if_chain = "1.0.2"
 proc-macro2 = "1.0.40"
diff --git a/lints/duplicate-mutable-accounts/rust-toolchain b/lints/duplicate-mutable-accounts/rust-toolchain
index e348c78..2056264 100644
--- a/lints/duplicate-mutable-accounts/rust-toolchain
+++ b/lints/duplicate-mutable-accounts/rust-toolchain
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2022-02-24"
+channel = "nightly-2022-06-30"
 components = ["llvm-tools-preview", "rustc-dev"]
diff --git a/lints/duplicate-mutable-accounts/src/lib.rs b/lints/duplicate-mutable-accounts/src/lib.rs
index 1667e23..580df4f 100644
--- a/lints/duplicate-mutable-accounts/src/lib.rs
+++ b/lints/duplicate-mutable-accounts/src/lib.rs
@@ -5,22 +5,24 @@ extern crate rustc_ast;
 extern crate rustc_hir;
 extern crate rustc_span;
 
-use proc_macro2::*;
-use quote::quote;
-use std::str::FromStr;
-
 use rustc_ast::{
-    token::TokenKind,
-    tokenstream::{TokenStream, TokenTree},
+    token::{Delimiter, Token, TokenKind},
+    tokenstream::{CursorRef, DelimSpan, TokenStream, TokenTree, TreeAndSpacing},
     AttrKind, Attribute, MacArgs,
 };
 use rustc_hir::def::Res;
 use rustc_hir::*;
 use rustc_lint::{LateContext, LateLintPass};
-use rustc_span::{def_id::DefId, symbol::Symbol, Span};
-use std::collections::{HashMap, HashSet, VecDeque};
+use rustc_span::{
+    def_id::DefId,
+    symbol::{Ident, Symbol},
+    Span, DUMMY_SP,
+};
+use std::collections::{HashMap, VecDeque};
 use std::default::Default;
 
+
+
 use clippy_utils::{diagnostics::span_lint_and_help, ty::match_type};
 use if_chain::if_chain;
 use solana_lints::paths;
@@ -54,6 +56,27 @@ struct DuplicateMutableAccounts {
 }
 
 impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
+    // fn check_mod(
+    //     &mut self,
+    //     cx: &LateContext<'tcx>,
+    //     _: &'tcx Mod<'tcx>,
+    //     span: Span,
+    //     _: HirId
+    // ) {
+    //     println!("new");
+    //     for _ in 0..3 {
+    //         println!("linting");
+    //         span_lint_and_help(
+    //             cx,
+    //             DUPLICATE_MUTABLE_ACCOUNTS,
+    //             span,
+    //             "dummy",
+    //             None,
+    //             ""
+    //         );
+    //     }
+    // }
+
     fn check_struct_def(&mut self, cx: &LateContext<'tcx>, variant_data: &'tcx VariantData<'tcx>) {
         if let VariantData::Struct(fields, _) = variant_data {
             fields.iter().for_each(|field| {
@@ -91,11 +114,11 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
             if name.as_str() == "account";
             if let MacArgs::Delimited(_, _, token_stream) = &attr_item.args;
             then {
-                // TODO: figure out stream representation. At this point, may parse?
-                // TODO: filter mechanism: only insert constraints that match form "constraint = _.key() != _.key()"
-                // TODO: may need to parse each constraint as a separate stream, as comma-delimited
-                self.streams.0.push(token_stream.clone());
-                // println!("{:#?}", attribute);
+                for split in split(token_stream.trees(), TokenKind::Comma) {
+                    // println!("{:#?}", split);
+                    self.streams.0.push(split);
+                }
+
             }
         }
     }
@@ -107,17 +130,29 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
                 // generate static set of possible constraints
                 let gen_constraints = generate_possible_expected_constraints(v);
 
-                // assert the following checks:
-                for (one, reflexive) in gen_constraints {
-                    if !(self.streams.contains(one) || self.streams.contains(reflexive)) {
-                        //     span_lint_and_help(
-                        //         cx,
-                        //         DUPLICATE_MUTABLE_ACCOUNTS,
-                        //         v[0].1,
-                        //         "identical account types",
-                        //         Some(v[1].1),
-                        //         &format!("add an anchor key check constraint: #[account(constraint = {}.key() != {}.key())]", v[0].0, v[1].0)
-                        //     );
+                for ((one, symmetric), symbols) in gen_constraints {
+                    // println!("{:#?}\n {:#?}", one, symmetric);
+                    if !(self.streams.contains(one) || self.streams.contains(symmetric)) {
+                        println!("lint for {} {}", symbols.0, symbols.1);
+
+                        // stupid way to get spans for offending types
+                        let mut spans: Vec<Span> = Vec::new();
+                        for (sym, span) in v {
+                            if &symbols.0 == sym || &symbols.1 == sym {
+                                spans.push(span.clone());
+                            }
+                        }
+
+                        // TODO: for some reason, will only print out 2 messages, not 3
+                        // println!("{:?}", spans);
+                        span_lint_and_help(
+                            cx,
+                            DUPLICATE_MUTABLE_ACCOUNTS,
+                            spans[0],
+                            "identical account types without a key check constraint",
+                            Some(spans[1]),
+                            &format!("add an anchor key check constraint: #[account(constraint = {}.key() != {}.key())]", symbols.0, symbols.1)
+                        );
                     }
                 }
             }
@@ -141,8 +176,29 @@ fn get_anchor_account_type(segment: &PathSegment<'_>) -> Option<DefId> {
     }
 }
 
+// collect elements into a TokenStream until encounter delim then stop collecting. create a new vec.
+// continue until reaching end of stream
+fn split(stream: CursorRef, delimiter: TokenKind) -> Vec<TokenStream> {
+    let mut split_streams: Vec<TokenStream> = Vec::new();
+    let mut temp: Vec<TreeAndSpacing> = Vec::new();
+    let delim = TokenTree::Token(Token::new(delimiter, DUMMY_SP));
+
+    stream.for_each(|t| {
+        if t.eq_unspanned(&delim) {
+            split_streams.push(TokenStream::new(temp.clone()));
+            temp.clear();
+        } else {
+            temp.push(TreeAndSpacing::from(t.to_owned()));
+        }
+    });
+    split_streams.push(TokenStream::new(temp));
+    split_streams
+}
+
 /// Generates a static set of a possible expected key check constraints necessary for `values`.
-fn generate_possible_expected_constraints(values: &Vec<(Symbol, Span)>) -> Vec<(proc_macro2::TokenStream, proc_macro2::TokenStream)> {
+fn generate_possible_expected_constraints(
+    values: &Vec<(Symbol, Span)>,
+) -> Vec<((TokenStream, TokenStream), (Symbol, Symbol))> {
     // TODO: may start with a VecDeque in the first place?
     let mut deq = VecDeque::from(values.clone());
     let mut gen_set = Vec::new();
@@ -151,28 +207,55 @@ fn generate_possible_expected_constraints(values: &Vec<(Symbol, Span)>) -> Vec<(
         let first = deq.pop_front().unwrap().0;
         // generate stream for all other values in vec
         for (other, _) in &deq {
-            let constraint = format!("constraint = {}.key() != {}.key()", first.as_str(), other.as_str());
-            let reflexive = format!("constraint = {}.key() != {}.key()", other.as_str(), first.as_str());      
-
-            // using quote
-            // let stream = quote!(constraint = first.as_str().key() != other.as_str().key());
-
-            let stream: proc_macro2::TokenStream = constraint.parse().unwrap();
-            let reflex_stream: proc_macro2::TokenStream = reflexive.parse().unwrap();
+            let stream = create_key_check_constraint_tokenstream(&first, other);
+            let symmetric_stream = create_key_check_constraint_tokenstream(other, &first);
             // println!("{:#?}", stream);
 
-            gen_set.push((stream, reflex_stream));
+            gen_set.push(((stream, symmetric_stream), (first, other.clone())));
         }
     }
     gen_set
 }
 
+// TODO: figure out more efficient way to do this
+fn create_key_check_constraint_tokenstream(a: &Symbol, b: &Symbol) -> TokenStream {
+    let constraint = vec![
+        // TODO: test string matching by changing some string
+        TreeAndSpacing::from(create_token("constraint")),
+        TreeAndSpacing::from(TokenTree::Token(Token::new(TokenKind::Eq, DUMMY_SP))),
+        TreeAndSpacing::from(create_token(a.as_str())),
+        TreeAndSpacing::from(TokenTree::Token(Token::new(TokenKind::Dot, DUMMY_SP))),
+        TreeAndSpacing::from(create_token("key")),
+        TreeAndSpacing::from(TokenTree::Delimited(
+            DelimSpan::dummy(),
+            Delimiter::Parenthesis,
+            TokenStream::new(vec![]),
+        )),
+        TreeAndSpacing::from(TokenTree::Token(Token::new(TokenKind::Ne, DUMMY_SP))),
+        TreeAndSpacing::from(create_token(b.as_str())),
+        TreeAndSpacing::from(TokenTree::Token(Token::new(TokenKind::Dot, DUMMY_SP))),
+        TreeAndSpacing::from(create_token("key")),
+        TreeAndSpacing::from(TokenTree::Delimited(
+            DelimSpan::dummy(),
+            Delimiter::Parenthesis,
+            TokenStream::new(vec![]),
+        )),
+    ];
+
+    TokenStream::new(constraint)
+}
+
+fn create_token(s: &str) -> TokenTree {
+    let ident = Ident::from_str(s);
+    TokenTree::Token(Token::from_ast_ident(ident))
+}
+
 #[derive(Debug, Default)]
 pub struct Streams(Vec<TokenStream>);
 
 impl Streams {
     fn contains(&self, other: TokenStream) -> bool {
-        self.0.iter().any(|stream| stream == &other)
+        self.0.iter().any(|stream| stream.eq_unspanned(&other))
     }
 }
 
@@ -190,27 +273,3 @@ fn insecure_2() {
 fn secure() {
     dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "secure");
 }
-
-// fn has_satisfying_stream(streams: &Vec<Stream>, field_names: &Vec<(Symbol, Span)>) -> bool {
-//     for stream in streams {
-//         if stream.contains(TokenKind::Ne)
-//             && field_names
-//                 .iter()
-//                 // TODO: if true, will not match. figure out what the bool signifies
-//                 .all(|(sym, _)| stream.contains(TokenKind::Ident(*sym, false)))
-//         {
-//             return true;
-//         }
-//     }
-//     return false;
-// }
-
-// Generates a TokenStream that matches `constraint = a.key() != b.key()` and its reflexive
-// fn generate_key_check_constraint(a: Symbol, b: Symbol) -> (TokenStream, TokenStream) {
-//     let mut tree_and_spacing = vec![];
-//     // create token
-//     let tree = TokenTree::token(TokenKind::Ident(Symbol::intern("constraint"), false), span); // TODO: generate span somehow
-//     tree_and_spacing.push(TreeAndSpacing::from(tree));
-
-//     TokenStream::new(tree_and_spacing)
-// }
diff --git a/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.rs b/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.rs
index 4324688..285fc47 100644
--- a/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.rs
+++ b/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.rs
@@ -22,9 +22,8 @@ pub mod duplicate_mutable_accounts_insecure {
 
 #[derive(Accounts)]
 pub struct Update<'info> {
-    #[account(constraint = user_a.key() != user_b.key())]
+    #[account(constraint = user_a.key() != user_b.key(), constraint = user_b.key() != user_c.key())]
     user_a: Account<'info, User>,
-    #[account(constraint = user_c.key() != user_b.key())]
     user_b: Account<'info, User>,
     user_c: Account<'info, User>,
 }
diff --git a/lints/duplicate-mutable-accounts/ui/secure/src/lib.rs b/lints/duplicate-mutable-accounts/ui/secure/src/lib.rs
index df1057d..12924e1 100644
--- a/lints/duplicate-mutable-accounts/ui/secure/src/lib.rs
+++ b/lints/duplicate-mutable-accounts/ui/secure/src/lib.rs
@@ -6,7 +6,11 @@ declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
 pub mod duplicate_mutable_accounts_secure {
     use super::*;
 
-    pub fn update_secure(ctx: Context<Update>, a: u64, b: u64) -> anchor_lang::solana_program::entrypoint::ProgramResult {
+    pub fn update_secure(
+        ctx: Context<Update>,
+        a: u64,
+        b: u64,
+    ) -> anchor_lang::solana_program::entrypoint::ProgramResult {
         let user_a = &mut ctx.accounts.user_a;
         let user_b = &mut ctx.accounts.user_b;
 

From cef270dc7079a8b6edf04dde816d790678663631 Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Sat, 16 Jul 2022 09:51:57 -0500
Subject: [PATCH 05/24] clean up code and add rustdocs

---
 lints/duplicate-mutable-accounts/src/lib.rs | 131 +++++++++-----------
 1 file changed, 58 insertions(+), 73 deletions(-)

diff --git a/lints/duplicate-mutable-accounts/src/lib.rs b/lints/duplicate-mutable-accounts/src/lib.rs
index 580df4f..d24ddfd 100644
--- a/lints/duplicate-mutable-accounts/src/lib.rs
+++ b/lints/duplicate-mutable-accounts/src/lib.rs
@@ -5,28 +5,28 @@ extern crate rustc_ast;
 extern crate rustc_hir;
 extern crate rustc_span;
 
+use std::collections::{HashMap, VecDeque};
+use std::default::Default;
+
 use rustc_ast::{
     token::{Delimiter, Token, TokenKind},
     tokenstream::{CursorRef, DelimSpan, TokenStream, TokenTree, TreeAndSpacing},
     AttrKind, Attribute, MacArgs,
 };
-use rustc_hir::def::Res;
-use rustc_hir::*;
+use rustc_hir::{def::Res, FieldDef, GenericArg, QPath, TyKind, VariantData};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_span::{
     def_id::DefId,
     symbol::{Ident, Symbol},
     Span, DUMMY_SP,
 };
-use std::collections::{HashMap, VecDeque};
-use std::default::Default;
-
-
 
 use clippy_utils::{diagnostics::span_lint_and_help, ty::match_type};
 use if_chain::if_chain;
 use solana_lints::paths;
 
+const ANCHOR_ACCOUNT_GENERIC_ARG_COUNT: usize = 2;
+
 dylint_linting::impl_late_lint! {
     /// **What it does:**
     ///
@@ -56,42 +56,14 @@ struct DuplicateMutableAccounts {
 }
 
 impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
-    // fn check_mod(
-    //     &mut self,
-    //     cx: &LateContext<'tcx>,
-    //     _: &'tcx Mod<'tcx>,
-    //     span: Span,
-    //     _: HirId
-    // ) {
-    //     println!("new");
-    //     for _ in 0..3 {
-    //         println!("linting");
-    //         span_lint_and_help(
-    //             cx,
-    //             DUPLICATE_MUTABLE_ACCOUNTS,
-    //             span,
-    //             "dummy",
-    //             None,
-    //             ""
-    //         );
-    //     }
-    // }
-
     fn check_struct_def(&mut self, cx: &LateContext<'tcx>, variant_data: &'tcx VariantData<'tcx>) {
         if let VariantData::Struct(fields, _) = variant_data {
             fields.iter().for_each(|field| {
                 if_chain! {
-                    // grab the def_id of the field type
-                    let ty = field.ty;
-                    if let TyKind::Path(qpath) = &ty.kind;
-                    if let QPath::Resolved(_, path) = qpath;
-                    if let Res::Def(_, def_id) = path.res;
-                    // match the type of the field
-                    let ty = cx.tcx.type_of(def_id);
-                    // check it is an anchor account type
-                    if match_type(cx, ty, &paths::ANCHOR_ACCOUNT);
-                    // check the type of T, the second generic arg
-                    let account_id = get_anchor_account_type(&path.segments[0]).unwrap();
+                    if let Some(def_id) = get_def_id(field.ty);
+                    let middle_ty = cx.tcx.type_of(def_id);
+                    if match_type(cx, middle_ty, &paths::ANCHOR_ACCOUNT);
+                    if let Some(account_id) = get_anchor_account_type_def_id(field);
                     then {
                         if let Some(v) = self.accounts.get_mut(&account_id) {
                             v.push((field.ident.name, field.span));
@@ -105,37 +77,29 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
     }
 
     fn check_attribute(&mut self, _: &LateContext<'tcx>, attribute: &'tcx Attribute) {
-        // println!("{:#?}", self.accounts);
         if_chain! {
             if let AttrKind::Normal(attr_item, _) = &attribute.kind;
-            let name = attr_item.path.segments[0].ident.name; // TODO: can use name_or_empty
-            // for some reason #[account] doesn't match when no args, maybe take away
-            // the code to check name, and just check it has constraint args?
+            let name = attribute.name_or_empty();
             if name.as_str() == "account";
             if let MacArgs::Delimited(_, _, token_stream) = &attr_item.args;
             then {
-                for split in split(token_stream.trees(), TokenKind::Comma) {
-                    // println!("{:#?}", split);
-                    self.streams.0.push(split);
+                // Parse each constraint as a separate TokenStream
+                for delimited_stream in split(token_stream.trees(), TokenKind::Comma) {
+                    self.streams.0.push(delimited_stream);
                 }
-
             }
         }
     }
 
     fn check_crate_post(&mut self, cx: &LateContext<'tcx>) {
         // println!("{:#?}", self);
-        for (_k, v) in self.accounts.iter() {
+        for (_, v) in self.accounts.iter() {
             if v.len() > 1 {
-                // generate static set of possible constraints
                 let gen_constraints = generate_possible_expected_constraints(v);
 
                 for ((one, symmetric), symbols) in gen_constraints {
-                    // println!("{:#?}\n {:#?}", one, symmetric);
                     if !(self.streams.contains(one) || self.streams.contains(symmetric)) {
-                        println!("lint for {} {}", symbols.0, symbols.1);
-
-                        // stupid way to get spans for offending types
+                        // get spans for offending types
                         let mut spans: Vec<Span> = Vec::new();
                         for (sym, span) in v {
                             if &symbols.0 == sym || &symbols.1 == sym {
@@ -144,7 +108,6 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
                         }
 
                         // TODO: for some reason, will only print out 2 messages, not 3
-                        // println!("{:?}", spans);
                         span_lint_and_help(
                             cx,
                             DUPLICATE_MUTABLE_ACCOUNTS,
@@ -160,11 +123,27 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
     }
 }
 
-fn get_anchor_account_type(segment: &PathSegment<'_>) -> Option<DefId> {
+/// Returns the `DefId` of the anchor account type, ie, `T` in `Account<'info, T>`.
+/// Returns `None` if the type of `field` is not an anchor account.
+fn get_anchor_account_type_def_id(field: &FieldDef) -> Option<DefId> {
+    if_chain! {
+        if let TyKind::Path(qpath) = &field.ty.kind;
+        if let QPath::Resolved(_, path) = qpath;
+        if path.segments.len() > 0;
+        if let Some(generic_args) = path.segments[0].args;
+        if generic_args.args.len() == ANCHOR_ACCOUNT_GENERIC_ARG_COUNT;
+        if let GenericArg::Type(hir_ty) = &generic_args.args[1];
+        then {
+            get_def_id(hir_ty)
+        } else {
+            None
+        }
+    }
+}
+
+/// Returns the `DefId` of `ty`, an hir type. Returns `None` if cannot resolve type.
+fn get_def_id(ty: &rustc_hir::Ty) -> Option<DefId> {
     if_chain! {
-        // TODO: the following logic to get def_id is a repeated pattern
-        if let Some(generic_args) = segment.args;
-        if let GenericArg::Type(ty) = &generic_args.args[1]; // the account type is the second generic arg
         if let TyKind::Path(qpath) = &ty.kind;
         if let QPath::Resolved(_, path) = qpath;
         if let Res::Def(_, def_id) = path.res;
@@ -176,8 +155,7 @@ fn get_anchor_account_type(segment: &PathSegment<'_>) -> Option<DefId> {
     }
 }
 
-// collect elements into a TokenStream until encounter delim then stop collecting. create a new vec.
-// continue until reaching end of stream
+/// Splits `stream` into a vector of substreams, separated by `delimiter`.
 fn split(stream: CursorRef, delimiter: TokenKind) -> Vec<TokenStream> {
     let mut split_streams: Vec<TokenStream> = Vec::new();
     let mut temp: Vec<TreeAndSpacing> = Vec::new();
@@ -195,12 +173,17 @@ fn split(stream: CursorRef, delimiter: TokenKind) -> Vec<TokenStream> {
     split_streams
 }
 
-/// Generates a static set of a possible expected key check constraints necessary for `values`.
+/// Generates a static set of possible expected key check constraints necessary for `identical_types`.
+/// `identical_types` is a set of identical types that must have a key check constraint. A vector of tuples
+/// is returned, where each element represents a particular constraint.
+///
+/// Specifically, the first field of the tuple is a tuple of `TokenStream`s, which represent the constraint and its
+/// symmetric value, e.g., `a!=b` and `b!=a`. The second field of the tuple is a tuple of symbols, which
+/// represent the identifiers being compared. Following the previous example, this would be `(a, b)`.
 fn generate_possible_expected_constraints(
-    values: &Vec<(Symbol, Span)>,
+    identical_types: &Vec<(Symbol, Span)>,
 ) -> Vec<((TokenStream, TokenStream), (Symbol, Symbol))> {
-    // TODO: may start with a VecDeque in the first place?
-    let mut deq = VecDeque::from(values.clone());
+    let mut deq = VecDeque::from(identical_types.clone());
     let mut gen_set = Vec::new();
 
     for _ in 0..deq.len() - 1 {
@@ -209,32 +192,31 @@ fn generate_possible_expected_constraints(
         for (other, _) in &deq {
             let stream = create_key_check_constraint_tokenstream(&first, other);
             let symmetric_stream = create_key_check_constraint_tokenstream(other, &first);
-            // println!("{:#?}", stream);
-
             gen_set.push(((stream, symmetric_stream), (first, other.clone())));
         }
     }
     gen_set
 }
 
-// TODO: figure out more efficient way to do this
+/// Returns a `TokenStream` of form: constraint = `a`.key() != `b`.key().
 fn create_key_check_constraint_tokenstream(a: &Symbol, b: &Symbol) -> TokenStream {
+    // TODO: may be more efficient way to do this, since the stream is effectively fixed
+    // and determined. Only two tokens are variable.
     let constraint = vec![
-        // TODO: test string matching by changing some string
-        TreeAndSpacing::from(create_token("constraint")),
+        TreeAndSpacing::from(create_token_from_ident("constraint")),
         TreeAndSpacing::from(TokenTree::Token(Token::new(TokenKind::Eq, DUMMY_SP))),
-        TreeAndSpacing::from(create_token(a.as_str())),
+        TreeAndSpacing::from(create_token_from_ident(a.as_str())),
         TreeAndSpacing::from(TokenTree::Token(Token::new(TokenKind::Dot, DUMMY_SP))),
-        TreeAndSpacing::from(create_token("key")),
+        TreeAndSpacing::from(create_token_from_ident("key")),
         TreeAndSpacing::from(TokenTree::Delimited(
             DelimSpan::dummy(),
             Delimiter::Parenthesis,
             TokenStream::new(vec![]),
         )),
         TreeAndSpacing::from(TokenTree::Token(Token::new(TokenKind::Ne, DUMMY_SP))),
-        TreeAndSpacing::from(create_token(b.as_str())),
+        TreeAndSpacing::from(create_token_from_ident(b.as_str())),
         TreeAndSpacing::from(TokenTree::Token(Token::new(TokenKind::Dot, DUMMY_SP))),
-        TreeAndSpacing::from(create_token("key")),
+        TreeAndSpacing::from(create_token_from_ident("key")),
         TreeAndSpacing::from(TokenTree::Delimited(
             DelimSpan::dummy(),
             Delimiter::Parenthesis,
@@ -245,7 +227,8 @@ fn create_key_check_constraint_tokenstream(a: &Symbol, b: &Symbol) -> TokenStrea
     TokenStream::new(constraint)
 }
 
-fn create_token(s: &str) -> TokenTree {
+/// Returns a `TokenTree::Token` which has `TokenKind::Ident`, with the string set to `s`.
+fn create_token_from_ident(s: &str) -> TokenTree {
     let ident = Ident::from_str(s);
     TokenTree::Token(Token::from_ast_ident(ident))
 }
@@ -254,6 +237,8 @@ fn create_token(s: &str) -> TokenTree {
 pub struct Streams(Vec<TokenStream>);
 
 impl Streams {
+    /// Returns true if `self` contains `other`, by comparing if there is an
+    /// identical `TokenStream` in `self` regardless of span.
     fn contains(&self, other: TokenStream) -> bool {
         self.0.iter().any(|stream| stream.eq_unspanned(&other))
     }

From a95e0f8e24aab67826a2c29452967cd95d51647f Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Sat, 16 Jul 2022 10:15:21 -0500
Subject: [PATCH 06/24] add tests for lint-6

---
 lints/duplicate-mutable-accounts/Cargo.toml   |   10 +-
 lints/duplicate-mutable-accounts/src/lib.rs   |   36 +-
 .../ui/insecure-2/Cargo.lock                  | 1315 -----------------
 .../ui/insecure-2/Cargo.toml                  |    2 +-
 .../ui/insecure-2/src/lib.stderr              |   10 +-
 .../ui/insecure/Cargo.lock                    | 1315 -----------------
 .../ui/insecure/src/lib.stderr                |    2 +-
 .../ui/recommended-2/Cargo.toml               |   19 +
 .../ui/recommended-2/Xargo.toml               |    2 +
 .../ui/recommended-2/src/lib.rs               |   38 +
 .../ui/recommended-2/src/lib.stderr           |    0
 .../ui/recommended/Cargo.toml                 |   19 +
 .../ui/recommended/Xargo.toml                 |    2 +
 .../ui/recommended/src/lib.rs                 |   35 +
 .../ui/recommended/src/lib.stderr             |    0
 .../ui/secure/Cargo.lock                      | 1315 -----------------
 .../ui/secure/Cargo.toml                      |    2 -
 .../ui/secure/src/lib.rs                      |    6 +-
 18 files changed, 158 insertions(+), 3970 deletions(-)
 delete mode 100644 lints/duplicate-mutable-accounts/ui/insecure-2/Cargo.lock
 delete mode 100644 lints/duplicate-mutable-accounts/ui/insecure/Cargo.lock
 create mode 100644 lints/duplicate-mutable-accounts/ui/recommended-2/Cargo.toml
 create mode 100644 lints/duplicate-mutable-accounts/ui/recommended-2/Xargo.toml
 create mode 100644 lints/duplicate-mutable-accounts/ui/recommended-2/src/lib.rs
 create mode 100644 lints/duplicate-mutable-accounts/ui/recommended-2/src/lib.stderr
 create mode 100644 lints/duplicate-mutable-accounts/ui/recommended/Cargo.toml
 create mode 100644 lints/duplicate-mutable-accounts/ui/recommended/Xargo.toml
 create mode 100644 lints/duplicate-mutable-accounts/ui/recommended/src/lib.rs
 create mode 100644 lints/duplicate-mutable-accounts/ui/recommended/src/lib.stderr
 delete mode 100644 lints/duplicate-mutable-accounts/ui/secure/Cargo.lock

diff --git a/lints/duplicate-mutable-accounts/Cargo.toml b/lints/duplicate-mutable-accounts/Cargo.toml
index b8aff35..7a2cb05 100644
--- a/lints/duplicate-mutable-accounts/Cargo.toml
+++ b/lints/duplicate-mutable-accounts/Cargo.toml
@@ -21,6 +21,14 @@ path = "ui/insecure-2/src/lib.rs"
 name = "secure"
 path = "ui/secure/src/lib.rs"
 
+[[example]]
+name = "recommended"
+path = "ui/recommended/src/lib.rs"
+
+[[example]]
+name = "recommended-2"
+path = "ui/recommended-2/src/lib.rs"
+
 [dependencies]
 clippy_utils = { git = "https://github.com/rust-lang/rust-clippy", rev = "0cb0f7636851f9fcc57085cf80197a2ef6db098f" }
 dylint_linting = "2.0.1"
@@ -30,8 +38,8 @@ quote = "1.0.20"
 solana-lints = { path = "../../crate" }
 
 [dev-dependencies]
-dylint_testing = "2.0.1"
 anchor-lang = "0.24.2"
+dylint_testing = "2.0.1"
 
 [workspace]
 
diff --git a/lints/duplicate-mutable-accounts/src/lib.rs b/lints/duplicate-mutable-accounts/src/lib.rs
index d24ddfd..cc0e0ba 100644
--- a/lints/duplicate-mutable-accounts/src/lib.rs
+++ b/lints/duplicate-mutable-accounts/src/lib.rs
@@ -93,17 +93,17 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
 
     fn check_crate_post(&mut self, cx: &LateContext<'tcx>) {
         // println!("{:#?}", self);
-        for (_, v) in self.accounts.iter() {
+        for v in self.accounts.values() {
             if v.len() > 1 {
                 let gen_constraints = generate_possible_expected_constraints(v);
 
                 for ((one, symmetric), symbols) in gen_constraints {
-                    if !(self.streams.contains(one) || self.streams.contains(symmetric)) {
+                    if !(self.streams.contains(&one) || self.streams.contains(&symmetric)) {
                         // get spans for offending types
                         let mut spans: Vec<Span> = Vec::new();
                         for (sym, span) in v {
                             if &symbols.0 == sym || &symbols.1 == sym {
-                                spans.push(span.clone());
+                                spans.push(*span);
                             }
                         }
 
@@ -129,7 +129,7 @@ fn get_anchor_account_type_def_id(field: &FieldDef) -> Option<DefId> {
     if_chain! {
         if let TyKind::Path(qpath) = &field.ty.kind;
         if let QPath::Resolved(_, path) = qpath;
-        if path.segments.len() > 0;
+        if !path.segments.is_empty();
         if let Some(generic_args) = path.segments[0].args;
         if generic_args.args.len() == ANCHOR_ACCOUNT_GENERIC_ARG_COUNT;
         if let GenericArg::Type(hir_ty) = &generic_args.args[1];
@@ -166,7 +166,7 @@ fn split(stream: CursorRef, delimiter: TokenKind) -> Vec<TokenStream> {
             split_streams.push(TokenStream::new(temp.clone()));
             temp.clear();
         } else {
-            temp.push(TreeAndSpacing::from(t.to_owned()));
+            temp.push(TreeAndSpacing::from(t.clone()));
         }
     });
     split_streams.push(TokenStream::new(temp));
@@ -181,25 +181,25 @@ fn split(stream: CursorRef, delimiter: TokenKind) -> Vec<TokenStream> {
 /// symmetric value, e.g., `a!=b` and `b!=a`. The second field of the tuple is a tuple of symbols, which
 /// represent the identifiers being compared. Following the previous example, this would be `(a, b)`.
 fn generate_possible_expected_constraints(
-    identical_types: &Vec<(Symbol, Span)>,
+    identical_types: &[(Symbol, Span)],
 ) -> Vec<((TokenStream, TokenStream), (Symbol, Symbol))> {
-    let mut deq = VecDeque::from(identical_types.clone());
+    let mut deq = VecDeque::from(identical_types.to_owned());
     let mut gen_set = Vec::new();
 
     for _ in 0..deq.len() - 1 {
         let first = deq.pop_front().unwrap().0;
         // generate stream for all other values in vec
         for (other, _) in &deq {
-            let stream = create_key_check_constraint_tokenstream(&first, other);
-            let symmetric_stream = create_key_check_constraint_tokenstream(other, &first);
-            gen_set.push(((stream, symmetric_stream), (first, other.clone())));
+            let stream = create_key_check_constraint_tokenstream(first, *other);
+            let symmetric_stream = create_key_check_constraint_tokenstream(*other, first);
+            gen_set.push(((stream, symmetric_stream), (first, *other)));
         }
     }
     gen_set
 }
 
 /// Returns a `TokenStream` of form: constraint = `a`.key() != `b`.key().
-fn create_key_check_constraint_tokenstream(a: &Symbol, b: &Symbol) -> TokenStream {
+fn create_key_check_constraint_tokenstream(a: Symbol, b: Symbol) -> TokenStream {
     // TODO: may be more efficient way to do this, since the stream is effectively fixed
     // and determined. Only two tokens are variable.
     let constraint = vec![
@@ -239,8 +239,8 @@ pub struct Streams(Vec<TokenStream>);
 impl Streams {
     /// Returns true if `self` contains `other`, by comparing if there is an
     /// identical `TokenStream` in `self` regardless of span.
-    fn contains(&self, other: TokenStream) -> bool {
-        self.0.iter().any(|stream| stream.eq_unspanned(&other))
+    fn contains(&self, other: &TokenStream) -> bool {
+        self.0.iter().any(|stream| stream.eq_unspanned(other))
     }
 }
 
@@ -258,3 +258,13 @@ fn insecure_2() {
 fn secure() {
     dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "secure");
 }
+
+#[test]
+fn recommended() {
+    dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "recommended");
+}
+
+#[test]
+fn recommended_2() {
+    dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "recommended-2");
+}
diff --git a/lints/duplicate-mutable-accounts/ui/insecure-2/Cargo.lock b/lints/duplicate-mutable-accounts/ui/insecure-2/Cargo.lock
deleted file mode 100644
index 9cb8d20..0000000
--- a/lints/duplicate-mutable-accounts/ui/insecure-2/Cargo.lock
+++ /dev/null
@@ -1,1315 +0,0 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
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-
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diff --git a/lints/duplicate-mutable-accounts/ui/insecure-2/Cargo.toml b/lints/duplicate-mutable-accounts/ui/insecure-2/Cargo.toml
index e0b71e3..8f90916 100644
--- a/lints/duplicate-mutable-accounts/ui/insecure-2/Cargo.toml
+++ b/lints/duplicate-mutable-accounts/ui/insecure-2/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "duplicate-mutable-accounts-insecure-2"
 version = "0.1.0"
-description = "Created with Anchor"
+description = "Does not have all required key constraint checks"
 edition = "2018"
 
 [lib]
diff --git a/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.stderr b/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.stderr
index 48cda15..d195376 100644
--- a/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.stderr
+++ b/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.stderr
@@ -1,14 +1,14 @@
-error: identical account types
-  --> $DIR/lib.rs:25:5
+error: identical account types without a key check constraint
+  --> $DIR/lib.rs:26:5
    |
 LL |     user_a: Account<'info, User>,
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `-D duplicate-mutable-accounts` implied by `-D warnings`
-help: add an anchor key check constraint: #[account(constraint = user_a.key() != user_b.key())]
-  --> $DIR/lib.rs:26:5
+help: add an anchor key check constraint: #[account(constraint = user_a.key() != user_c.key())]
+  --> $DIR/lib.rs:28:5
    |
-LL |     user_b: Account<'info, User>,
+LL |     user_c: Account<'info, User>,
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: aborting due to previous error
diff --git a/lints/duplicate-mutable-accounts/ui/insecure/Cargo.lock b/lints/duplicate-mutable-accounts/ui/insecure/Cargo.lock
deleted file mode 100644
index 9cb8d20..0000000
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-
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-
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diff --git a/lints/duplicate-mutable-accounts/ui/insecure/src/lib.stderr b/lints/duplicate-mutable-accounts/ui/insecure/src/lib.stderr
index 48cda15..6a4ef64 100644
--- a/lints/duplicate-mutable-accounts/ui/insecure/src/lib.stderr
+++ b/lints/duplicate-mutable-accounts/ui/insecure/src/lib.stderr
@@ -1,4 +1,4 @@
-error: identical account types
+error: identical account types without a key check constraint
   --> $DIR/lib.rs:25:5
    |
 LL |     user_a: Account<'info, User>,
diff --git a/lints/duplicate-mutable-accounts/ui/recommended-2/Cargo.toml b/lints/duplicate-mutable-accounts/ui/recommended-2/Cargo.toml
new file mode 100644
index 0000000..631313c
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/ui/recommended-2/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
+name = "duplicate-mutable-accounts-recommended"
+version = "0.1.0"
+description = "Contains all necessary constraints for more than 2 duplicate accounts"
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib", "lib"]
+name = "duplicate_mutable_accounts_recommended"
+
+[features]
+no-entrypoint = []
+no-idl = []
+no-log-ix-name = []
+cpi = ["no-entrypoint"]
+default = []
+
+[dependencies]
+anchor-lang = "0.24.2"
diff --git a/lints/duplicate-mutable-accounts/ui/recommended-2/Xargo.toml b/lints/duplicate-mutable-accounts/ui/recommended-2/Xargo.toml
new file mode 100644
index 0000000..475fb71
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/ui/recommended-2/Xargo.toml
@@ -0,0 +1,2 @@
+[target.bpfel-unknown-unknown.dependencies.std]
+features = []
diff --git a/lints/duplicate-mutable-accounts/ui/recommended-2/src/lib.rs b/lints/duplicate-mutable-accounts/ui/recommended-2/src/lib.rs
new file mode 100644
index 0000000..2fbacd0
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/ui/recommended-2/src/lib.rs
@@ -0,0 +1,38 @@
+use anchor_lang::prelude::*;
+
+declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
+
+#[program]
+pub mod duplicate_mutable_accounts_recommended {
+    use super::*;
+
+    pub fn update(
+        ctx: Context<Update>,
+        a: u64,
+        b: u64,
+    ) -> anchor_lang::solana_program::entrypoint::ProgramResult {
+        let user_a = &mut ctx.accounts.user_a;
+        let user_b = &mut ctx.accounts.user_b;
+
+        user_a.data = a;
+        user_b.data = b;
+        Ok(())
+    }
+}
+
+#[derive(Accounts)]
+pub struct Update<'info> {
+    #[account(constraint = user_a.key() != user_b.key())]
+    #[account(constraint = user_a.key() != user_c.key())]
+    #[account(constraint = user_c.key() != user_b.key())]
+    user_a: Account<'info, User>,
+    user_b: Account<'info, User>,
+    user_c: Account<'info, User>,
+}
+
+#[account]
+pub struct User {
+    data: u64,
+}
+
+fn main() {}
diff --git a/lints/duplicate-mutable-accounts/ui/recommended-2/src/lib.stderr b/lints/duplicate-mutable-accounts/ui/recommended-2/src/lib.stderr
new file mode 100644
index 0000000..e69de29
diff --git a/lints/duplicate-mutable-accounts/ui/recommended/Cargo.toml b/lints/duplicate-mutable-accounts/ui/recommended/Cargo.toml
new file mode 100644
index 0000000..45a53d1
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/ui/recommended/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
+name = "duplicate-mutable-accounts-recommended"
+version = "0.1.0"
+description = "Created with Anchor"
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib", "lib"]
+name = "duplicate_mutable_accounts_recommended"
+
+[features]
+no-entrypoint = []
+no-idl = []
+no-log-ix-name = []
+cpi = ["no-entrypoint"]
+default = []
+
+[dependencies]
+anchor-lang = "0.24.2"
diff --git a/lints/duplicate-mutable-accounts/ui/recommended/Xargo.toml b/lints/duplicate-mutable-accounts/ui/recommended/Xargo.toml
new file mode 100644
index 0000000..475fb71
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/ui/recommended/Xargo.toml
@@ -0,0 +1,2 @@
+[target.bpfel-unknown-unknown.dependencies.std]
+features = []
diff --git a/lints/duplicate-mutable-accounts/ui/recommended/src/lib.rs b/lints/duplicate-mutable-accounts/ui/recommended/src/lib.rs
new file mode 100644
index 0000000..059fef2
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/ui/recommended/src/lib.rs
@@ -0,0 +1,35 @@
+use anchor_lang::prelude::*;
+
+declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
+
+#[program]
+pub mod duplicate_mutable_accounts_recommended {
+    use super::*;
+
+    pub fn update(
+        ctx: Context<Update>,
+        a: u64,
+        b: u64,
+    ) -> anchor_lang::solana_program::entrypoint::ProgramResult {
+        let user_a = &mut ctx.accounts.user_a;
+        let user_b = &mut ctx.accounts.user_b;
+
+        user_a.data = a;
+        user_b.data = b;
+        Ok(())
+    }
+}
+
+#[derive(Accounts)]
+pub struct Update<'info> {
+    #[account(constraint = user_a.key() != user_b.key())]
+    user_a: Account<'info, User>,
+    user_b: Account<'info, User>,
+}
+
+#[account]
+pub struct User {
+    data: u64,
+}
+
+fn main() {}
diff --git a/lints/duplicate-mutable-accounts/ui/recommended/src/lib.stderr b/lints/duplicate-mutable-accounts/ui/recommended/src/lib.stderr
new file mode 100644
index 0000000..e69de29
diff --git a/lints/duplicate-mutable-accounts/ui/secure/Cargo.lock b/lints/duplicate-mutable-accounts/ui/secure/Cargo.lock
deleted file mode 100644
index ad9c1fd..0000000
--- a/lints/duplicate-mutable-accounts/ui/secure/Cargo.lock
+++ /dev/null
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- "bv",
- "generic-array",
- "log",
- "memmap2",
- "rustc_version",
- "serde",
- "serde_derive",
- "sha2",
- "solana-frozen-abi-macro",
- "solana-logger",
- "thiserror",
-]
-
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- "syn",
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-
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- "log",
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-
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- "bitflags",
- "blake3",
- "borsh",
- "borsh-derive",
- "bs58 0.4.0",
- "bv",
- "bytemuck",
- "console_error_panic_hook",
- "console_log",
- "curve25519-dalek",
- "getrandom 0.1.16",
- "itertools",
- "js-sys",
- "lazy_static",
- "libsecp256k1",
- "log",
- "num-derive",
- "num-traits",
- "parking_lot",
- "rand",
- "rustc_version",
- "rustversion",
- "serde",
- "serde_bytes",
- "serde_derive",
- "sha2",
- "sha3",
- "solana-frozen-abi",
- "solana-frozen-abi-macro",
- "solana-logger",
- "solana-sdk-macro",
- "thiserror",
- "wasm-bindgen",
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-
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- "syn",
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- "unicode-ident",
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-
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-
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- "cfg-if",
- "wasm-bindgen-macro",
-]
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-name = "wasm-bindgen-backend"
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5491a68ab4500fa6b4d726bd67408630c3dbe9c4fe7bda16d5c82a1fd8c7340a"
-dependencies = [
- "bumpalo",
- "lazy_static",
- "log",
- "proc-macro2",
- "quote",
- "syn",
- "wasm-bindgen-shared",
-]
-
-[[package]]
-name = "wasm-bindgen-macro"
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-]
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- "proc-macro2",
- "quote",
- "syn",
- "wasm-bindgen-backend",
- "wasm-bindgen-shared",
-]
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-
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- "js-sys",
- "wasm-bindgen",
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- "winapi-i686-pc-windows-gnu",
- "winapi-x86_64-pc-windows-gnu",
-]
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- "winapi",
-]
-
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-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "09041cd90cf85f7f8b2df60c646f853b7f535ce68f85244eb6731cf89fa498ec"
-
-[[package]]
-name = "zeroize"
-version = "1.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4756f7db3f7b5574938c3eb1c117038b8e07f95ee6718c0efad4ac21508f1efd"
diff --git a/lints/duplicate-mutable-accounts/ui/secure/Cargo.toml b/lints/duplicate-mutable-accounts/ui/secure/Cargo.toml
index b32565c..66812b2 100644
--- a/lints/duplicate-mutable-accounts/ui/secure/Cargo.toml
+++ b/lints/duplicate-mutable-accounts/ui/secure/Cargo.toml
@@ -15,7 +15,5 @@ no-log-ix-name = []
 cpi = ["no-entrypoint"]
 default = []
 
-[workspace]
-
 [dependencies]
 anchor-lang = "0.24.2"
diff --git a/lints/duplicate-mutable-accounts/ui/secure/src/lib.rs b/lints/duplicate-mutable-accounts/ui/secure/src/lib.rs
index 12924e1..b637022 100644
--- a/lints/duplicate-mutable-accounts/ui/secure/src/lib.rs
+++ b/lints/duplicate-mutable-accounts/ui/secure/src/lib.rs
@@ -6,11 +6,14 @@ declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
 pub mod duplicate_mutable_accounts_secure {
     use super::*;
 
-    pub fn update_secure(
+    pub fn update(
         ctx: Context<Update>,
         a: u64,
         b: u64,
     ) -> anchor_lang::solana_program::entrypoint::ProgramResult {
+        if ctx.accounts.user_a.key() == ctx.accounts.user_b.key() {
+            return Err(ProgramError::InvalidArgument);
+        }
         let user_a = &mut ctx.accounts.user_a;
         let user_b = &mut ctx.accounts.user_b;
 
@@ -22,7 +25,6 @@ pub mod duplicate_mutable_accounts_secure {
 
 #[derive(Accounts)]
 pub struct Update<'info> {
-    #[account(constraint = user_a.key() != user_b.key())]
     user_a: Account<'info, User>,
     user_b: Account<'info, User>,
 }

From 6a309afb519414c82dbf0d64a50d29a5c0e4ace8 Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Mon, 18 Jul 2022 14:43:50 -0500
Subject: [PATCH 07/24] make lint more efficient by not storing generated
 streams

---
 lints/duplicate-mutable-accounts/src/lib.rs | 65 +++++++--------------
 1 file changed, 20 insertions(+), 45 deletions(-)

diff --git a/lints/duplicate-mutable-accounts/src/lib.rs b/lints/duplicate-mutable-accounts/src/lib.rs
index cc0e0ba..9de1442 100644
--- a/lints/duplicate-mutable-accounts/src/lib.rs
+++ b/lints/duplicate-mutable-accounts/src/lib.rs
@@ -95,27 +95,27 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
         // println!("{:#?}", self);
         for v in self.accounts.values() {
             if v.len() > 1 {
-                let gen_constraints = generate_possible_expected_constraints(v);
-
-                for ((one, symmetric), symbols) in gen_constraints {
-                    if !(self.streams.contains(&one) || self.streams.contains(&symmetric)) {
-                        // get spans for offending types
-                        let mut spans: Vec<Span> = Vec::new();
-                        for (sym, span) in v {
-                            if &symbols.0 == sym || &symbols.1 == sym {
-                                spans.push(*span);
-                            }
+                let mut deq = VecDeque::from(v.to_owned());
+                for _ in 0..deq.len() - 1 {
+                    let (first, first_span) = deq.pop_front().unwrap();
+                    for (other, other_span) in &deq {
+                        let stream = create_key_check_constraint_tokenstream(first, *other);
+                        let symmetric_stream =
+                            create_key_check_constraint_tokenstream(*other, first);
+
+                        if !(self.streams.contains(&stream)
+                            || self.streams.contains(&symmetric_stream))
+                        {
+                            // NOTE: for some reason, will only print out 2 messages, not 3
+                            span_lint_and_help(
+                                cx,
+                                DUPLICATE_MUTABLE_ACCOUNTS,
+                                first_span,
+                                "identical account types without a key check constraint",
+                                Some(*other_span),
+                                &format!("add an anchor key check constraint: #[account(constraint = {}.key() != {}.key())]", first, other)
+                            );
                         }
-
-                        // TODO: for some reason, will only print out 2 messages, not 3
-                        span_lint_and_help(
-                            cx,
-                            DUPLICATE_MUTABLE_ACCOUNTS,
-                            spans[0],
-                            "identical account types without a key check constraint",
-                            Some(spans[1]),
-                            &format!("add an anchor key check constraint: #[account(constraint = {}.key() != {}.key())]", symbols.0, symbols.1)
-                        );
                     }
                 }
             }
@@ -173,31 +173,6 @@ fn split(stream: CursorRef, delimiter: TokenKind) -> Vec<TokenStream> {
     split_streams
 }
 
-/// Generates a static set of possible expected key check constraints necessary for `identical_types`.
-/// `identical_types` is a set of identical types that must have a key check constraint. A vector of tuples
-/// is returned, where each element represents a particular constraint.
-///
-/// Specifically, the first field of the tuple is a tuple of `TokenStream`s, which represent the constraint and its
-/// symmetric value, e.g., `a!=b` and `b!=a`. The second field of the tuple is a tuple of symbols, which
-/// represent the identifiers being compared. Following the previous example, this would be `(a, b)`.
-fn generate_possible_expected_constraints(
-    identical_types: &[(Symbol, Span)],
-) -> Vec<((TokenStream, TokenStream), (Symbol, Symbol))> {
-    let mut deq = VecDeque::from(identical_types.to_owned());
-    let mut gen_set = Vec::new();
-
-    for _ in 0..deq.len() - 1 {
-        let first = deq.pop_front().unwrap().0;
-        // generate stream for all other values in vec
-        for (other, _) in &deq {
-            let stream = create_key_check_constraint_tokenstream(first, *other);
-            let symmetric_stream = create_key_check_constraint_tokenstream(*other, first);
-            gen_set.push(((stream, symmetric_stream), (first, *other)));
-        }
-    }
-    gen_set
-}
-
 /// Returns a `TokenStream` of form: constraint = `a`.key() != `b`.key().
 fn create_key_check_constraint_tokenstream(a: Symbol, b: Symbol) -> TokenStream {
     // TODO: may be more efficient way to do this, since the stream is effectively fixed

From 30ef2a064fe0e9d8604d1e92ad7d882f52add44e Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Mon, 18 Jul 2022 19:13:38 -0500
Subject: [PATCH 08/24] make lint-6v1 handle anchor constraints that are not
 comma-delimited

---
 lints/duplicate-mutable-accounts/src/lib.rs   | 84 ++++++++++++-------
 .../ui/recommended-2/src/lib.rs               |  3 +-
 2 files changed, 57 insertions(+), 30 deletions(-)

diff --git a/lints/duplicate-mutable-accounts/src/lib.rs b/lints/duplicate-mutable-accounts/src/lib.rs
index 9de1442..40b497c 100644
--- a/lints/duplicate-mutable-accounts/src/lib.rs
+++ b/lints/duplicate-mutable-accounts/src/lib.rs
@@ -10,7 +10,7 @@ use std::default::Default;
 
 use rustc_ast::{
     token::{Delimiter, Token, TokenKind},
-    tokenstream::{CursorRef, DelimSpan, TokenStream, TokenTree, TreeAndSpacing},
+    tokenstream::{DelimSpan, TokenStream, TokenTree, TreeAndSpacing},
     AttrKind, Attribute, MacArgs,
 };
 use rustc_hir::{def::Res, FieldDef, GenericArg, QPath, TyKind, VariantData};
@@ -84,9 +84,10 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
             if let MacArgs::Delimited(_, _, token_stream) = &attr_item.args;
             then {
                 // Parse each constraint as a separate TokenStream
-                for delimited_stream in split(token_stream.trees(), TokenKind::Comma) {
-                    self.streams.0.push(delimited_stream);
-                }
+                // for delimited_stream in split(token_stream.trees(), TokenKind::Comma) {
+                //     self.streams.0.push(delimited_stream);
+                // }
+                self.streams.0.push(token_stream.clone());
             }
         }
     }
@@ -107,6 +108,7 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
                             || self.streams.contains(&symmetric_stream))
                         {
                             // NOTE: for some reason, will only print out 2 messages, not 3
+                            // println!("spanning lint");
                             span_lint_and_help(
                                 cx,
                                 DUPLICATE_MUTABLE_ACCOUNTS,
@@ -155,31 +157,11 @@ fn get_def_id(ty: &rustc_hir::Ty) -> Option<DefId> {
     }
 }
 
-/// Splits `stream` into a vector of substreams, separated by `delimiter`.
-fn split(stream: CursorRef, delimiter: TokenKind) -> Vec<TokenStream> {
-    let mut split_streams: Vec<TokenStream> = Vec::new();
-    let mut temp: Vec<TreeAndSpacing> = Vec::new();
-    let delim = TokenTree::Token(Token::new(delimiter, DUMMY_SP));
-
-    stream.for_each(|t| {
-        if t.eq_unspanned(&delim) {
-            split_streams.push(TokenStream::new(temp.clone()));
-            temp.clear();
-        } else {
-            temp.push(TreeAndSpacing::from(t.clone()));
-        }
-    });
-    split_streams.push(TokenStream::new(temp));
-    split_streams
-}
-
-/// Returns a `TokenStream` of form: constraint = `a`.key() != `b`.key().
+/// Returns a `TokenStream` of form: `a`.key() != `b`.key().
 fn create_key_check_constraint_tokenstream(a: Symbol, b: Symbol) -> TokenStream {
     // TODO: may be more efficient way to do this, since the stream is effectively fixed
     // and determined. Only two tokens are variable.
     let constraint = vec![
-        TreeAndSpacing::from(create_token_from_ident("constraint")),
-        TreeAndSpacing::from(TokenTree::Token(Token::new(TokenKind::Eq, DUMMY_SP))),
         TreeAndSpacing::from(create_token_from_ident(a.as_str())),
         TreeAndSpacing::from(TokenTree::Token(Token::new(TokenKind::Dot, DUMMY_SP))),
         TreeAndSpacing::from(create_token_from_ident("key")),
@@ -212,13 +194,59 @@ fn create_token_from_ident(s: &str) -> TokenTree {
 pub struct Streams(Vec<TokenStream>);
 
 impl Streams {
-    /// Returns true if `self` contains `other`, by comparing if there is an
-    /// identical `TokenStream` in `self` regardless of span.
+    /// Returns true if `self` has a TokenStream that `other` is a substream of
     fn contains(&self, other: &TokenStream) -> bool {
-        self.0.iter().any(|stream| stream.eq_unspanned(other))
+        self.0
+            .iter()
+            .any(|token_stream| Self::is_substream(token_stream, other))
+    }
+
+    /// Returns true if `other` is a substream of `stream`. By substream we mean in the
+    /// sense of a substring.
+    // NOTE: a possible optimization is when a match is found, to remove the matched
+    // TokenTrees from the TokenStream, since the constraint has been "checked" so it never
+    // needs to be validated again. This cuts down the number of comparisons.
+    fn is_substream(stream: &TokenStream, other: &TokenStream) -> bool {
+        let other_len = other.len();
+        for i in 0..stream.len() {
+            for (j, other_token) in other.trees().enumerate() {
+                match stream.trees().nth(i + j) {
+                    Some(token_tree) => {
+                        // println!("Comparing {:#?} with {:#?}", token_tree, other_tokens[j]);
+                        if !token_tree.eq_unspanned(other_token) {
+                            break;
+                        }
+                        // reached last index, so we have a match
+                        if j == other_len - 1 {
+                            return true;
+                        }
+                    }
+                    None => return false, // reached end of stream
+                }
+            }
+        }
+        false
     }
 }
 
+// /// Splits `stream` into a vector of substreams, separated by `delimiter`.
+// fn split(stream: CursorRef, delimiter: TokenKind) -> Vec<TokenStream> {
+//     let mut split_streams: Vec<TokenStream> = Vec::new();
+//     let mut temp: Vec<TreeAndSpacing> = Vec::new();
+//     let delim = TokenTree::Token(Token::new(delimiter, DUMMY_SP));
+
+//     stream.for_each(|t| {
+//         if t.eq_unspanned(&delim) {
+//             split_streams.push(TokenStream::new(temp.clone()));
+//             temp.clear();
+//         } else {
+//             temp.push(TreeAndSpacing::from(t.clone()));
+//         }
+//     });
+//     split_streams.push(TokenStream::new(temp));
+//     split_streams
+// }
+
 #[test]
 fn insecure() {
     dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "insecure");
diff --git a/lints/duplicate-mutable-accounts/ui/recommended-2/src/lib.rs b/lints/duplicate-mutable-accounts/ui/recommended-2/src/lib.rs
index 2fbacd0..338054b 100644
--- a/lints/duplicate-mutable-accounts/ui/recommended-2/src/lib.rs
+++ b/lints/duplicate-mutable-accounts/ui/recommended-2/src/lib.rs
@@ -22,8 +22,7 @@ pub mod duplicate_mutable_accounts_recommended {
 
 #[derive(Accounts)]
 pub struct Update<'info> {
-    #[account(constraint = user_a.key() != user_b.key())]
-    #[account(constraint = user_a.key() != user_c.key())]
+    #[account(constraint = user_a.key() != user_b.key() && user_a.key() != user_c.key())]
     #[account(constraint = user_c.key() != user_b.key())]
     user_a: Account<'info, User>,
     user_b: Account<'info, User>,

From a670bab93bf5520e4ef71a5eae228881409bb895 Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Tue, 19 Jul 2022 07:39:57 -0500
Subject: [PATCH 09/24] fix lint spanning deduplication issue

---
 lints/duplicate-mutable-accounts/src/lib.rs   | 27 +---------------
 .../ui/insecure-2/src/lib.rs                  |  1 -
 .../ui/insecure-2/src/lib.stderr              | 32 ++++++++++++++++---
 .../ui/insecure/src/lib.stderr                |  2 +-
 4 files changed, 30 insertions(+), 32 deletions(-)

diff --git a/lints/duplicate-mutable-accounts/src/lib.rs b/lints/duplicate-mutable-accounts/src/lib.rs
index 40b497c..e24bcac 100644
--- a/lints/duplicate-mutable-accounts/src/lib.rs
+++ b/lints/duplicate-mutable-accounts/src/lib.rs
@@ -83,10 +83,6 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
             if name.as_str() == "account";
             if let MacArgs::Delimited(_, _, token_stream) = &attr_item.args;
             then {
-                // Parse each constraint as a separate TokenStream
-                // for delimited_stream in split(token_stream.trees(), TokenKind::Comma) {
-                //     self.streams.0.push(delimited_stream);
-                // }
                 self.streams.0.push(token_stream.clone());
             }
         }
@@ -107,13 +103,11 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
                         if !(self.streams.contains(&stream)
                             || self.streams.contains(&symmetric_stream))
                         {
-                            // NOTE: for some reason, will only print out 2 messages, not 3
-                            // println!("spanning lint");
                             span_lint_and_help(
                                 cx,
                                 DUPLICATE_MUTABLE_ACCOUNTS,
                                 first_span,
-                                "identical account types without a key check constraint",
+                                &format!("{} and {} have identical account types but do not have a key check constraint", first, other),
                                 Some(*other_span),
                                 &format!("add an anchor key check constraint: #[account(constraint = {}.key() != {}.key())]", first, other)
                             );
@@ -212,7 +206,6 @@ impl Streams {
             for (j, other_token) in other.trees().enumerate() {
                 match stream.trees().nth(i + j) {
                     Some(token_tree) => {
-                        // println!("Comparing {:#?} with {:#?}", token_tree, other_tokens[j]);
                         if !token_tree.eq_unspanned(other_token) {
                             break;
                         }
@@ -229,24 +222,6 @@ impl Streams {
     }
 }
 
-// /// Splits `stream` into a vector of substreams, separated by `delimiter`.
-// fn split(stream: CursorRef, delimiter: TokenKind) -> Vec<TokenStream> {
-//     let mut split_streams: Vec<TokenStream> = Vec::new();
-//     let mut temp: Vec<TreeAndSpacing> = Vec::new();
-//     let delim = TokenTree::Token(Token::new(delimiter, DUMMY_SP));
-
-//     stream.for_each(|t| {
-//         if t.eq_unspanned(&delim) {
-//             split_streams.push(TokenStream::new(temp.clone()));
-//             temp.clear();
-//         } else {
-//             temp.push(TreeAndSpacing::from(t.clone()));
-//         }
-//     });
-//     split_streams.push(TokenStream::new(temp));
-//     split_streams
-// }
-
 #[test]
 fn insecure() {
     dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "insecure");
diff --git a/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.rs b/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.rs
index 285fc47..0bd77a5 100644
--- a/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.rs
+++ b/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.rs
@@ -22,7 +22,6 @@ pub mod duplicate_mutable_accounts_insecure {
 
 #[derive(Accounts)]
 pub struct Update<'info> {
-    #[account(constraint = user_a.key() != user_b.key(), constraint = user_b.key() != user_c.key())]
     user_a: Account<'info, User>,
     user_b: Account<'info, User>,
     user_c: Account<'info, User>,
diff --git a/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.stderr b/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.stderr
index d195376..94e9791 100644
--- a/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.stderr
+++ b/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.stderr
@@ -1,15 +1,39 @@
-error: identical account types without a key check constraint
-  --> $DIR/lib.rs:26:5
+error: user_a and user_b have identical account types but do not have a key check constraint
+  --> $DIR/lib.rs:25:5
    |
 LL |     user_a: Account<'info, User>,
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `-D duplicate-mutable-accounts` implied by `-D warnings`
+help: add an anchor key check constraint: #[account(constraint = user_a.key() != user_b.key())]
+  --> $DIR/lib.rs:26:5
+   |
+LL |     user_b: Account<'info, User>,
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: user_a and user_c have identical account types but do not have a key check constraint
+  --> $DIR/lib.rs:25:5
+   |
+LL |     user_a: Account<'info, User>,
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
 help: add an anchor key check constraint: #[account(constraint = user_a.key() != user_c.key())]
-  --> $DIR/lib.rs:28:5
+  --> $DIR/lib.rs:27:5
+   |
+LL |     user_c: Account<'info, User>,
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: user_b and user_c have identical account types but do not have a key check constraint
+  --> $DIR/lib.rs:26:5
+   |
+LL |     user_b: Account<'info, User>,
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: add an anchor key check constraint: #[account(constraint = user_b.key() != user_c.key())]
+  --> $DIR/lib.rs:27:5
    |
 LL |     user_c: Account<'info, User>,
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to previous error
+error: aborting due to 3 previous errors
 
diff --git a/lints/duplicate-mutable-accounts/ui/insecure/src/lib.stderr b/lints/duplicate-mutable-accounts/ui/insecure/src/lib.stderr
index 6a4ef64..064418c 100644
--- a/lints/duplicate-mutable-accounts/ui/insecure/src/lib.stderr
+++ b/lints/duplicate-mutable-accounts/ui/insecure/src/lib.stderr
@@ -1,4 +1,4 @@
-error: identical account types without a key check constraint
+error: user_a and user_b have identical account types but do not have a key check constraint
   --> $DIR/lib.rs:25:5
    |
 LL |     user_a: Account<'info, User>,

From 2149980cff0a38bb70626bb0bd52be5ab05ff73e Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Sun, 17 Jul 2022 15:09:47 -0500
Subject: [PATCH 10/24] implement lint-6 v2 to handle constraints not in
 #[account] macro

---
 .../dup_mutable_accounts_2/.cargo/config.toml |   11 +
 lints/dup_mutable_accounts_2/.gitignore       |    1 +
 lints/dup_mutable_accounts_2/Cargo.lock       | 1797 +++++++++++++++++
 lints/dup_mutable_accounts_2/Cargo.toml       |   33 +
 lints/dup_mutable_accounts_2/README.md        |   19 +
 lints/dup_mutable_accounts_2/rust-toolchain   |    3 +
 lints/dup_mutable_accounts_2/src/lib.rs       |  186 ++
 .../ui/insecure/Cargo.toml                    |   19 +
 .../ui/insecure/Xargo.toml                    |    2 +
 .../ui/insecure/src/lib.rs                    |   34 +
 .../ui/insecure/src/lib.stderr                |   27 +
 .../ui/secure/Cargo.lock                      | 1315 ++++++++++++
 .../ui/secure/Cargo.toml                      |   19 +
 .../ui/secure/Xargo.toml                      |    2 +
 .../ui/secure/src/lib.rs                      |   37 +
 15 files changed, 3505 insertions(+)
 create mode 100644 lints/dup_mutable_accounts_2/.cargo/config.toml
 create mode 100644 lints/dup_mutable_accounts_2/.gitignore
 create mode 100644 lints/dup_mutable_accounts_2/Cargo.lock
 create mode 100644 lints/dup_mutable_accounts_2/Cargo.toml
 create mode 100644 lints/dup_mutable_accounts_2/README.md
 create mode 100644 lints/dup_mutable_accounts_2/rust-toolchain
 create mode 100644 lints/dup_mutable_accounts_2/src/lib.rs
 create mode 100644 lints/dup_mutable_accounts_2/ui/insecure/Cargo.toml
 create mode 100644 lints/dup_mutable_accounts_2/ui/insecure/Xargo.toml
 create mode 100644 lints/dup_mutable_accounts_2/ui/insecure/src/lib.rs
 create mode 100644 lints/dup_mutable_accounts_2/ui/insecure/src/lib.stderr
 create mode 100644 lints/dup_mutable_accounts_2/ui/secure/Cargo.lock
 create mode 100644 lints/dup_mutable_accounts_2/ui/secure/Cargo.toml
 create mode 100644 lints/dup_mutable_accounts_2/ui/secure/Xargo.toml
 create mode 100644 lints/dup_mutable_accounts_2/ui/secure/src/lib.rs

diff --git a/lints/dup_mutable_accounts_2/.cargo/config.toml b/lints/dup_mutable_accounts_2/.cargo/config.toml
new file mode 100644
index 0000000..46d1571
--- /dev/null
+++ b/lints/dup_mutable_accounts_2/.cargo/config.toml
@@ -0,0 +1,11 @@
+[target.aarch64-apple-darwin]
+linker = "dylint-link"
+
+[target.x86_64-apple-darwin]
+linker = "dylint-link"
+
+[target.x86_64-unknown-linux-gnu]
+linker = "dylint-link"
+
+[target.x86_64-pc-windows-msvc]
+linker = "dylint-link"
diff --git a/lints/dup_mutable_accounts_2/.gitignore b/lints/dup_mutable_accounts_2/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/lints/dup_mutable_accounts_2/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/lints/dup_mutable_accounts_2/Cargo.lock b/lints/dup_mutable_accounts_2/Cargo.lock
new file mode 100644
index 0000000..76fde76
--- /dev/null
+++ b/lints/dup_mutable_accounts_2/Cargo.lock
@@ -0,0 +1,1797 @@
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diff --git a/lints/dup_mutable_accounts_2/Cargo.toml b/lints/dup_mutable_accounts_2/Cargo.toml
new file mode 100644
index 0000000..4811999
--- /dev/null
+++ b/lints/dup_mutable_accounts_2/Cargo.toml
@@ -0,0 +1,33 @@
+[package]
+name = "dup_mutable_accounts_2"
+version = "0.1.0"
+authors = ["authors go here"]
+description = "description goes here"
+edition = "2018"
+publish = false
+
+[lib]
+crate-type = ["cdylib"]
+
+[[example]]
+name = "insecure"
+path = "ui/insecure/src/lib.rs"
+
+[[example]]
+name = "secure"
+path = "ui/secure/src/lib.rs"
+
+[dependencies]
+clippy_utils = { git = "https://github.com/rust-lang/rust-clippy", rev = "0cb0f7636851f9fcc57085cf80197a2ef6db098f" }
+dylint_linting = "2.0.7"
+if_chain = "1.0.2"
+solana-lints = { path = "../../crate" }
+
+[dev-dependencies]
+anchor-lang = "0.24.2"
+dylint_testing = "2.0.7"
+
+[workspace]
+
+[package.metadata.rust-analyzer]
+rustc_private = true
diff --git a/lints/dup_mutable_accounts_2/README.md b/lints/dup_mutable_accounts_2/README.md
new file mode 100644
index 0000000..f3079a7
--- /dev/null
+++ b/lints/dup_mutable_accounts_2/README.md
@@ -0,0 +1,19 @@
+# template
+
+**What it does:**
+
+**Why is this bad?**
+
+**Known problems:** None.
+
+**Example:**
+
+```rust
+// example code where a warning is issued
+```
+
+Use instead:
+
+```rust
+// example code that does not raise a warning
+```
diff --git a/lints/dup_mutable_accounts_2/rust-toolchain b/lints/dup_mutable_accounts_2/rust-toolchain
new file mode 100644
index 0000000..2056264
--- /dev/null
+++ b/lints/dup_mutable_accounts_2/rust-toolchain
@@ -0,0 +1,3 @@
+[toolchain]
+channel = "nightly-2022-06-30"
+components = ["llvm-tools-preview", "rustc-dev"]
diff --git a/lints/dup_mutable_accounts_2/src/lib.rs b/lints/dup_mutable_accounts_2/src/lib.rs
new file mode 100644
index 0000000..83f347f
--- /dev/null
+++ b/lints/dup_mutable_accounts_2/src/lib.rs
@@ -0,0 +1,186 @@
+#![feature(rustc_private)]
+#![warn(unused_extern_crates)]
+
+extern crate rustc_hir;
+extern crate rustc_middle;
+extern crate rustc_span;
+
+use clippy_utils::{
+    diagnostics::{span_lint_and_help, span_lint_and_note},
+    ty::match_type,
+    SpanlessEq,
+};
+use if_chain::if_chain;
+use rustc_hir::{
+    def_id::DefId,
+    intravisit::{walk_expr, FnKind, Visitor},
+    Body, Expr, ExprKind, FnDecl, HirId, Mutability,
+};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::TyKind;
+use rustc_span::Span;
+use solana_lints::{paths, utils::visit_expr_no_bodies};
+
+use std::collections::HashMap;
+
+const ANCHOR_ACCOUNT_GENERIC_ARG_COUNT: usize = 2;
+
+dylint_linting::declare_late_lint! {
+    /// **What it does:**
+    ///
+    /// **Why is this bad?**
+    ///
+    /// **Known problems:** None.
+    ///
+    /// **Example:**
+    ///
+    /// ```rust
+    /// // example code where a warning is issued
+    /// ```
+    /// Use instead:
+    /// ```rust
+    /// // example code that does not raise a warning
+    /// ```
+    pub DUP_MUTABLE_ACCOUNTS_2,
+    Warn,
+    "description goes here"
+}
+
+impl<'tcx> LateLintPass<'tcx> for DupMutableAccounts2 {
+    fn check_fn(
+        &mut self,
+        cx: &LateContext<'tcx>,
+        _: FnKind<'tcx>,
+        _: &'tcx FnDecl<'tcx>,
+        body: &'tcx Body<'tcx>,
+        span: Span,
+        _: HirId,
+    ) {
+        if !span.from_expansion() {
+            let accounts = get_referenced_accounts(cx, body);
+
+            accounts.values().for_each(|exprs| {
+                // TODO: figure out handling of >2 accounts
+                match exprs.len() {
+                    2 => {
+                        let first = exprs[0];
+                        let second = exprs[1];
+                        if !contains_key_call(cx, body, first) {
+                            span_lint_and_help(
+                                cx,
+                                DUP_MUTABLE_ACCOUNTS_2,
+                                first.span,
+                                "this expression does not have a key check but has the same account type as another expression",
+                                Some(second.span),
+                                "add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()",
+                            );
+                        }
+                        if !contains_key_call(cx, body, second) {
+                            span_lint_and_help(
+                                cx,
+                                DUP_MUTABLE_ACCOUNTS_2,
+                                second.span,
+                                "this expression does not have a key check but has the same account type as another expression",
+                                Some(first.span),
+                                "add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()",
+                            );
+                        }
+                    },
+                    n if n > 2 => {
+                        span_lint_and_note(
+                            cx,
+                            DUP_MUTABLE_ACCOUNTS_2,
+                            exprs[0].span,
+                            &format!("the following expression has the same account type as {} other accounts", exprs.len()),
+                            None,
+                            "might not check that each account has a unique key"
+                        )
+                    },
+                    _ => {}
+                }
+            });
+        }
+    }
+}
+
+struct AccountUses<'cx, 'tcx> {
+    cx: &'cx LateContext<'tcx>,
+    uses: HashMap<DefId, Vec<&'tcx Expr<'tcx>>>,
+}
+
+fn get_referenced_accounts<'tcx>(
+    cx: &LateContext<'tcx>,
+    body: &'tcx Body<'tcx>,
+) -> HashMap<DefId, Vec<&'tcx Expr<'tcx>>> {
+    let mut accounts = AccountUses {
+        cx,
+        uses: HashMap::new(),
+    };
+
+    accounts.visit_expr(&body.value);
+    accounts.uses
+}
+
+impl<'cx, 'tcx> Visitor<'tcx> for AccountUses<'cx, 'tcx> {
+    fn visit_expr(&mut self, expr: &'tcx Expr<'tcx>) {
+        if_chain! {
+            // get mutable reference expressions
+            if let ExprKind::AddrOf(_, mutability, mut_expr) = expr.kind;
+            if let Mutability::Mut = mutability;
+            // check type of expr == Account<'info, T>
+            let middle_ty = self.cx.typeck_results().expr_ty(mut_expr);
+            if match_type(self.cx, middle_ty, &paths::ANCHOR_ACCOUNT);
+            // grab T generic parameter
+            if let TyKind::Adt(_adt_def, substs) = middle_ty.kind();
+            if substs.len() == ANCHOR_ACCOUNT_GENERIC_ARG_COUNT;
+            let account_type = substs[1].expect_ty(); // TODO: could just store middle::Ty instead of DefId?
+            if let Some(adt_def) = account_type.ty_adt_def();
+            then {
+                let def_id = adt_def.did();
+                if let Some(exprs) = self.uses.get_mut(&def_id) {
+                    let mut spanless_eq = SpanlessEq::new(self.cx);
+                    // check that expr is not a duplicate within its particular key-pair
+                    if exprs.iter().all(|e| !spanless_eq.eq_expr(e, mut_expr)) {
+                        exprs.push(mut_expr);
+                    }
+                } else {
+                    self.uses.insert(def_id, vec![mut_expr]);
+                }
+            }
+        }
+        walk_expr(self, expr);
+    }
+}
+
+/// Performs a walk on `body`, checking whether there exists an expression that contains
+/// a `key()` method call on `account_expr`.
+fn contains_key_call<'tcx>(
+    cx: &LateContext<'tcx>,
+    body: &'tcx Body<'tcx>,
+    account_expr: &Expr<'tcx>,
+) -> bool {
+    visit_expr_no_bodies(&body.value, |expr| {
+        if_chain! {
+            if let ExprKind::MethodCall(path_seg, exprs, _span) = expr.kind;
+            if path_seg.ident.name.as_str() == "key";
+            if !exprs.is_empty();
+            let mut spanless_eq = SpanlessEq::new(cx);
+            if spanless_eq.eq_expr(&exprs[0], account_expr);
+            then {
+                true
+            } else {
+                false
+            }
+        }
+    })
+}
+
+#[test]
+fn insecure() {
+    dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "insecure");
+}
+
+#[test]
+fn secure() {
+    dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "secure");
+}
diff --git a/lints/dup_mutable_accounts_2/ui/insecure/Cargo.toml b/lints/dup_mutable_accounts_2/ui/insecure/Cargo.toml
new file mode 100644
index 0000000..6ab1b59
--- /dev/null
+++ b/lints/dup_mutable_accounts_2/ui/insecure/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
+name = "duplicate-mutable-accounts-insecure"
+version = "0.1.0"
+description = "Created with Anchor"
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib", "lib"]
+name = "duplicate_mutable_accounts_insecure"
+
+[features]
+no-entrypoint = []
+no-idl = []
+no-log-ix-name = []
+cpi = ["no-entrypoint"]
+default = []
+
+[dependencies]
+anchor-lang = "0.24.2"
diff --git a/lints/dup_mutable_accounts_2/ui/insecure/Xargo.toml b/lints/dup_mutable_accounts_2/ui/insecure/Xargo.toml
new file mode 100644
index 0000000..475fb71
--- /dev/null
+++ b/lints/dup_mutable_accounts_2/ui/insecure/Xargo.toml
@@ -0,0 +1,2 @@
+[target.bpfel-unknown-unknown.dependencies.std]
+features = []
diff --git a/lints/dup_mutable_accounts_2/ui/insecure/src/lib.rs b/lints/dup_mutable_accounts_2/ui/insecure/src/lib.rs
new file mode 100644
index 0000000..2e1d708
--- /dev/null
+++ b/lints/dup_mutable_accounts_2/ui/insecure/src/lib.rs
@@ -0,0 +1,34 @@
+use anchor_lang::prelude::*;
+
+declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
+
+#[program]
+pub mod duplicate_mutable_accounts_insecure {
+    use super::*;
+
+    pub fn update(
+        ctx: Context<Update>,
+        a: u64,
+        b: u64,
+    ) -> anchor_lang::solana_program::entrypoint::ProgramResult {
+        let user_a = &mut ctx.accounts.user_a;
+        let user_b = &mut ctx.accounts.user_b;
+
+        user_a.data = a;
+        user_b.data = b;
+        Ok(())
+    }
+}
+
+#[derive(Accounts)]
+pub struct Update<'info> {
+    user_a: Account<'info, User>,
+    user_b: Account<'info, User>,
+}
+
+#[account]
+pub struct User {
+    data: u64,
+}
+
+fn main() {}
diff --git a/lints/dup_mutable_accounts_2/ui/insecure/src/lib.stderr b/lints/dup_mutable_accounts_2/ui/insecure/src/lib.stderr
new file mode 100644
index 0000000..5a5c4ee
--- /dev/null
+++ b/lints/dup_mutable_accounts_2/ui/insecure/src/lib.stderr
@@ -0,0 +1,27 @@
+error: this expression does not have a key check but has the same account type as another expression
+  --> $DIR/lib.rs:14:27
+   |
+LL |         let user_a = &mut ctx.accounts.user_a;
+   |                           ^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `-D dup-mutable-accounts-2` implied by `-D warnings`
+help: add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()
+  --> $DIR/lib.rs:15:27
+   |
+LL |         let user_b = &mut ctx.accounts.user_b;
+   |                           ^^^^^^^^^^^^^^^^^^^
+
+error: this expression does not have a key check but has the same account type as another expression
+  --> $DIR/lib.rs:15:27
+   |
+LL |         let user_b = &mut ctx.accounts.user_b;
+   |                           ^^^^^^^^^^^^^^^^^^^
+   |
+help: add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()
+  --> $DIR/lib.rs:14:27
+   |
+LL |         let user_a = &mut ctx.accounts.user_a;
+   |                           ^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 2 previous errors
+
diff --git a/lints/dup_mutable_accounts_2/ui/secure/Cargo.lock b/lints/dup_mutable_accounts_2/ui/secure/Cargo.lock
new file mode 100644
index 0000000..9090753
--- /dev/null
+++ b/lints/dup_mutable_accounts_2/ui/secure/Cargo.lock
@@ -0,0 +1,1315 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "ahash"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+ "once_cell",
+ "version_check",
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+
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+ "memchr",
+]
+
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+name = "wasm-bindgen-shared"
+version = "0.2.81"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a89911bd99e5f3659ec4acf9c4d93b0a90fe4a2a11f15328472058edc5261be"
+
+[[package]]
+name = "web-sys"
+version = "0.3.58"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2fed94beee57daf8dd7d51f2b15dc2bcde92d7a72304cdf662a4371008b71b90"
+dependencies = [
+ "js-sys",
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "yansi"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09041cd90cf85f7f8b2df60c646f853b7f535ce68f85244eb6731cf89fa498ec"
+
+[[package]]
+name = "zeroize"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4756f7db3f7b5574938c3eb1c117038b8e07f95ee6718c0efad4ac21508f1efd"
diff --git a/lints/dup_mutable_accounts_2/ui/secure/Cargo.toml b/lints/dup_mutable_accounts_2/ui/secure/Cargo.toml
new file mode 100644
index 0000000..66812b2
--- /dev/null
+++ b/lints/dup_mutable_accounts_2/ui/secure/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
+name = "duplicate-mutable-accounts-secure"
+version = "0.1.0"
+description = "Created with Anchor"
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib", "lib"]
+name = "duplicate_mutable_accounts_secure"
+
+[features]
+no-entrypoint = []
+no-idl = []
+no-log-ix-name = []
+cpi = ["no-entrypoint"]
+default = []
+
+[dependencies]
+anchor-lang = "0.24.2"
diff --git a/lints/dup_mutable_accounts_2/ui/secure/Xargo.toml b/lints/dup_mutable_accounts_2/ui/secure/Xargo.toml
new file mode 100644
index 0000000..475fb71
--- /dev/null
+++ b/lints/dup_mutable_accounts_2/ui/secure/Xargo.toml
@@ -0,0 +1,2 @@
+[target.bpfel-unknown-unknown.dependencies.std]
+features = []
diff --git a/lints/dup_mutable_accounts_2/ui/secure/src/lib.rs b/lints/dup_mutable_accounts_2/ui/secure/src/lib.rs
new file mode 100644
index 0000000..b637022
--- /dev/null
+++ b/lints/dup_mutable_accounts_2/ui/secure/src/lib.rs
@@ -0,0 +1,37 @@
+use anchor_lang::prelude::*;
+
+declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
+
+#[program]
+pub mod duplicate_mutable_accounts_secure {
+    use super::*;
+
+    pub fn update(
+        ctx: Context<Update>,
+        a: u64,
+        b: u64,
+    ) -> anchor_lang::solana_program::entrypoint::ProgramResult {
+        if ctx.accounts.user_a.key() == ctx.accounts.user_b.key() {
+            return Err(ProgramError::InvalidArgument);
+        }
+        let user_a = &mut ctx.accounts.user_a;
+        let user_b = &mut ctx.accounts.user_b;
+
+        user_a.data = a;
+        user_b.data = b;
+        Ok(())
+    }
+}
+
+#[derive(Accounts)]
+pub struct Update<'info> {
+    user_a: Account<'info, User>,
+    user_b: Account<'info, User>,
+}
+
+#[account]
+pub struct User {
+    data: u64,
+}
+
+fn main() {}

From 70d7c5706e27a3eaafe5a26c198cac1a6a116f87 Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Mon, 18 Jul 2022 08:34:36 -0500
Subject: [PATCH 11/24] start merging lint 6 into one lint

---
 lints/duplicate-mutable-accounts/src/lib.rs | 230 +++++++++++++++++---
 1 file changed, 196 insertions(+), 34 deletions(-)

diff --git a/lints/duplicate-mutable-accounts/src/lib.rs b/lints/duplicate-mutable-accounts/src/lib.rs
index e24bcac..669d644 100644
--- a/lints/duplicate-mutable-accounts/src/lib.rs
+++ b/lints/duplicate-mutable-accounts/src/lib.rs
@@ -115,41 +115,101 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
                     }
                 }
             }
+        } else {
+            // perform alternate constraint check, e.g., check fn bodies, then check key checks
+            self.check_fn()
+        }
+
+        // TODO: how to enforce that this is only called when necessary?
+        fn check_fn(
+            &mut self,
+            cx: &LateContext<'tcx>,
+            _: FnKind<'tcx>,
+            _: &'tcx FnDecl<'tcx>,
+            body: &'tcx Body<'tcx>,
+            span: Span,
+            _: HirId,
+        ) {
+            if !span.from_expansion() {
+                let accounts = get_referenced_accounts(cx, body);
+                
+                accounts.values().for_each(|exprs| {
+                    // TODO: figure out handling of >2 accounts
+                    match exprs.len() {
+                        2 => {
+                            let first = exprs[0];
+                            let second = exprs[1];
+                            if !contains_key_call(cx, body, first) {
+                                span_lint_and_help(
+                                    cx,
+                                    DUP_MUTABLE_ACCOUNTS_2,
+                                    first.span,
+                                    "this expression does not have a key check but has the same account type as another expression",
+                                    Some(second.span),
+                                    "add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()",
+                                );
+                            }
+                            if !contains_key_call(cx, body, second) {
+                                span_lint_and_help(
+                                    cx,
+                                    DUP_MUTABLE_ACCOUNTS_2,
+                                    second.span,
+                                    "this expression does not have a key check but has the same account type as another expression",
+                                    Some(first.span),
+                                    "add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()",
+                                );
+                            }
+                        },
+                        n if n > 2 => {
+                            span_lint_and_note(
+                                cx,
+                                DUP_MUTABLE_ACCOUNTS_2,
+                                exprs[0].span,
+                                &format!("the following expression has the same account type as {} other accounts", exprs.len()),
+                                None,
+                                "might not check that each account has a unique key"
+                            )
+                        },
+                        _ => {}
+                    }
+                });
+            }
         }
     }
 }
 
-/// Returns the `DefId` of the anchor account type, ie, `T` in `Account<'info, T>`.
-/// Returns `None` if the type of `field` is not an anchor account.
-fn get_anchor_account_type_def_id(field: &FieldDef) -> Option<DefId> {
-    if_chain! {
-        if let TyKind::Path(qpath) = &field.ty.kind;
-        if let QPath::Resolved(_, path) = qpath;
-        if !path.segments.is_empty();
-        if let Some(generic_args) = path.segments[0].args;
-        if generic_args.args.len() == ANCHOR_ACCOUNT_GENERIC_ARG_COUNT;
-        if let GenericArg::Type(hir_ty) = &generic_args.args[1];
-        then {
-            get_def_id(hir_ty)
-        } else {
-            None
+mod anchor_constraint_check {
+    /// Returns the `DefId` of the anchor account type, ie, `T` in `Account<'info, T>`.
+    /// Returns `None` if the type of `field` is not an anchor account.
+    fn get_anchor_account_type_def_id(field: &FieldDef) -> Option<DefId> {
+        if_chain! {
+            if let TyKind::Path(qpath) = &field.ty.kind;
+            if let QPath::Resolved(_, path) = qpath;
+            if !path.segments.is_empty();
+            if let Some(generic_args) = path.segments[0].args;
+            if generic_args.args.len() == ANCHOR_ACCOUNT_GENERIC_ARG_COUNT;
+            if let GenericArg::Type(hir_ty) = &generic_args.args[1];
+            then {
+                get_def_id(hir_ty)
+            } else {
+                None
+            }
         }
     }
-}
 
-/// Returns the `DefId` of `ty`, an hir type. Returns `None` if cannot resolve type.
-fn get_def_id(ty: &rustc_hir::Ty) -> Option<DefId> {
-    if_chain! {
-        if let TyKind::Path(qpath) = &ty.kind;
-        if let QPath::Resolved(_, path) = qpath;
-        if let Res::Def(_, def_id) = path.res;
-        then {
-            Some(def_id)
-        } else {
-            None
+    /// Returns the `DefId` of `ty`, an hir type. Returns `None` if cannot resolve type.
+    fn get_def_id(ty: &rustc_hir::Ty) -> Option<DefId> {
+        if_chain! {
+            if let TyKind::Path(qpath) = &ty.kind;
+            if let QPath::Resolved(_, path) = qpath;
+            if let Res::Def(_, def_id) = path.res;
+            then {
+                Some(def_id)
+            } else {
+                None
+            }
         }
     }
-}
 
 /// Returns a `TokenStream` of form: `a`.key() != `b`.key().
 fn create_key_check_constraint_tokenstream(a: Symbol, b: Symbol) -> TokenStream {
@@ -175,17 +235,27 @@ fn create_key_check_constraint_tokenstream(a: Symbol, b: Symbol) -> TokenStream
         )),
     ];
 
-    TokenStream::new(constraint)
-}
+        TokenStream::new(constraint)
+    }
+
+    /// Returns a `TokenTree::Token` which has `TokenKind::Ident`, with the string set to `s`.
+    fn create_token_from_ident(s: &str) -> TokenTree {
+        let ident = Ident::from_str(s);
+        TokenTree::Token(Token::from_ast_ident(ident))
+    }
+
+    #[derive(Debug, Default)]
+    pub struct Streams(Vec<TokenStream>);
 
-/// Returns a `TokenTree::Token` which has `TokenKind::Ident`, with the string set to `s`.
-fn create_token_from_ident(s: &str) -> TokenTree {
-    let ident = Ident::from_str(s);
-    TokenTree::Token(Token::from_ast_ident(ident))
+    impl Streams {
+        /// Returns true if `self` contains `other`, by comparing if there is an
+        /// identical `TokenStream` in `self` regardless of span.
+        fn contains(&self, other: &TokenStream) -> bool {
+            self.0.iter().any(|stream| stream.eq_unspanned(other))
+        }
+    }
 }
 
-#[derive(Debug, Default)]
-pub struct Streams(Vec<TokenStream>);
 
 impl Streams {
     /// Returns true if `self` has a TokenStream that `other` is a substream of
@@ -222,6 +292,98 @@ impl Streams {
     }
 }
 
+mod alternate_constraint_check {
+    struct AccountUses<'cx, 'tcx> {
+        cx: &'cx LateContext<'tcx>,
+        uses: HashMap<DefId, Vec<&'tcx Expr<'tcx>>>,
+    }
+    
+    fn get_referenced_accounts<'tcx>(
+        cx: &LateContext<'tcx>,
+        body: &'tcx Body<'tcx>,
+    ) -> HashMap<DefId, Vec<&'tcx Expr<'tcx>>> {
+        let mut accounts = AccountUses {
+            cx,
+            uses: HashMap::new(),
+        };
+    
+        accounts.visit_expr(&body.value);
+        accounts.uses
+    }
+    
+    impl<'cx, 'tcx> Visitor<'tcx> for AccountUses<'cx, 'tcx> {
+        fn visit_expr(&mut self, expr: &'tcx Expr<'tcx>) {
+            if_chain! {
+                // get mutable reference expressions
+                if let ExprKind::AddrOf(_, mutability, mut_expr) = expr.kind;
+                if let Mutability::Mut = mutability;
+                // check type of expr == Account<'info, T>
+                let middle_ty = self.cx.typeck_results().expr_ty(mut_expr);
+                if match_type(self.cx, middle_ty, &paths::ANCHOR_ACCOUNT);
+                // grab T generic parameter
+                if let TyKind::Adt(_adt_def, substs) = middle_ty.kind();
+                if substs.len() == ANCHOR_ACCOUNT_GENERIC_ARG_COUNT;
+                let account_type = substs[1].expect_ty(); // TODO: could just store middle::Ty instead of DefId?
+                if let Some(adt_def) = account_type.ty_adt_def();
+                then {
+                    let def_id = adt_def.did();
+                    if let Some(exprs) = self.uses.get_mut(&def_id) {
+                        let mut spanless_eq = SpanlessEq::new(self.cx);
+                        // check that expr is not a duplicate within its particular key-pair
+                        if exprs.iter().all(|e| !spanless_eq.eq_expr(e, mut_expr)) {
+                            exprs.push(mut_expr);
+                        }
+                    } else {
+                        self.uses.insert(def_id, vec![mut_expr]);
+                    }
+                }
+            }
+            walk_expr(self, expr);
+        }
+    }
+    
+    /// Performs a walk on `body`, checking whether there exists an expression that contains
+    /// a `key()` method call on `account_expr`.
+    fn contains_key_call<'tcx>(
+        cx: &LateContext<'tcx>,
+        body: &'tcx Body<'tcx>,
+        account_expr: &Expr<'tcx>,
+    ) -> bool {
+        visit_expr_no_bodies(&body.value, |expr| {
+            if_chain! {
+                if let ExprKind::MethodCall(path_seg, exprs, _span) = expr.kind;
+                if path_seg.ident.name.as_str() == "key";
+                if !exprs.is_empty();
+                let mut spanless_eq = SpanlessEq::new(cx);
+                if spanless_eq.eq_expr(&exprs[0], account_expr);
+                then {
+                    true
+                } else {
+                    false
+                }
+            }
+        })
+    }
+}
+
+// /// Splits `stream` into a vector of substreams, separated by `delimiter`.
+// fn split(stream: CursorRef, delimiter: TokenKind) -> Vec<TokenStream> {
+//     let mut split_streams: Vec<TokenStream> = Vec::new();
+//     let mut temp: Vec<TreeAndSpacing> = Vec::new();
+//     let delim = TokenTree::Token(Token::new(delimiter, DUMMY_SP));
+
+//     stream.for_each(|t| {
+//         if t.eq_unspanned(&delim) {
+//             split_streams.push(TokenStream::new(temp.clone()));
+//             temp.clear();
+//         } else {
+//             temp.push(TreeAndSpacing::from(t.clone()));
+//         }
+//     });
+//     split_streams.push(TokenStream::new(temp));
+//     split_streams
+// }
+
 #[test]
 fn insecure() {
     dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "insecure");

From 5abb5e3054a0b8c44c71e75b6dbb3bcdc061a776 Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Mon, 18 Jul 2022 11:17:00 -0500
Subject: [PATCH 12/24] implement lint6v2 to better handle more than 2
 identical accounts

---
 lints/dup_mutable_accounts_2/src/lib.rs       | 175 ++++++++++--------
 .../ui/secure/src/lib.rs                      |   5 +
 2 files changed, 104 insertions(+), 76 deletions(-)

diff --git a/lints/dup_mutable_accounts_2/src/lib.rs b/lints/dup_mutable_accounts_2/src/lib.rs
index 83f347f..df99235 100644
--- a/lints/dup_mutable_accounts_2/src/lib.rs
+++ b/lints/dup_mutable_accounts_2/src/lib.rs
@@ -14,7 +14,7 @@ use if_chain::if_chain;
 use rustc_hir::{
     def_id::DefId,
     intravisit::{walk_expr, FnKind, Visitor},
-    Body, Expr, ExprKind, FnDecl, HirId, Mutability,
+    BinOpKind, Body, Expr, ExprKind, FnDecl, HirId, Mutability,
 };
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty::TyKind;
@@ -57,71 +57,80 @@ impl<'tcx> LateLintPass<'tcx> for DupMutableAccounts2 {
         _: HirId,
     ) {
         if !span.from_expansion() {
-            let accounts = get_referenced_accounts(cx, body);
-
-            accounts.values().for_each(|exprs| {
-                // TODO: figure out handling of >2 accounts
-                match exprs.len() {
-                    2 => {
-                        let first = exprs[0];
-                        let second = exprs[1];
-                        if !contains_key_call(cx, body, first) {
-                            span_lint_and_help(
-                                cx,
-                                DUP_MUTABLE_ACCOUNTS_2,
-                                first.span,
-                                "this expression does not have a key check but has the same account type as another expression",
-                                Some(second.span),
-                                "add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()",
-                            );
-                        }
-                        if !contains_key_call(cx, body, second) {
-                            span_lint_and_help(
-                                cx,
-                                DUP_MUTABLE_ACCOUNTS_2,
-                                second.span,
-                                "this expression does not have a key check but has the same account type as another expression",
-                                Some(first.span),
-                                "add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()",
-                            );
+            // get all mutable references to Accounts and if_statements in body
+            let mut values = Values::new(cx);
+            values.get_referenced_accounts_and_if_statements(cx, body);
+            // println!("{:#?}", values.if_statements);
+
+            values.accounts.values().for_each(|exprs| {
+                if exprs.len() > 1 {
+                    for current in 0..exprs.len() - 1 {
+                        for next in current + 1..exprs.len() {
+                            if !values.check_key_constraint(exprs[current], exprs[next]) {
+                                span_lint_and_help(
+                                    cx,
+                                    DUP_MUTABLE_ACCOUNTS_2,
+                                    exprs[current].span,
+                                    "the following expressions have equivalent Account types, yet do not contain a proper key check.",
+                                    Some(exprs[next].span),
+                                    "add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()",
+                                );
+                            }
                         }
-                    },
-                    n if n > 2 => {
-                        span_lint_and_note(
-                            cx,
-                            DUP_MUTABLE_ACCOUNTS_2,
-                            exprs[0].span,
-                            &format!("the following expression has the same account type as {} other accounts", exprs.len()),
-                            None,
-                            "might not check that each account has a unique key"
-                        )
-                    },
-                    _ => {}
+                    }
                 }
             });
         }
     }
 }
 
-struct AccountUses<'cx, 'tcx> {
+struct Values<'cx, 'tcx> {
     cx: &'cx LateContext<'tcx>,
-    uses: HashMap<DefId, Vec<&'tcx Expr<'tcx>>>,
+    accounts: HashMap<DefId, Vec<&'tcx Expr<'tcx>>>,
+    if_statements: Vec<(&'tcx Expr<'tcx>, &'tcx Expr<'tcx>)>,
 }
 
-fn get_referenced_accounts<'tcx>(
-    cx: &LateContext<'tcx>,
-    body: &'tcx Body<'tcx>,
-) -> HashMap<DefId, Vec<&'tcx Expr<'tcx>>> {
-    let mut accounts = AccountUses {
-        cx,
-        uses: HashMap::new(),
-    };
-
-    accounts.visit_expr(&body.value);
-    accounts.uses
+impl<'cx, 'tcx> Values<'cx, 'tcx> {
+    fn new(cx: &'cx LateContext<'tcx>) -> Self {
+        Values {
+            cx,
+            accounts: HashMap::new(),
+            if_statements: Vec::new(),
+        }
+    }
+
+    fn get_referenced_accounts_and_if_statements(
+        &mut self,
+        cx: &'cx LateContext<'tcx>,
+        body: &'tcx Body<'tcx>,
+    ) -> &Self {
+        self.visit_expr(&body.value);
+        self
+    }
+
+    /// Checks if there is a valid key constraint for `first_account` and `second_account`.
+    /// NOTE: currently only considers `first.key() == second.key()` or the symmetric relation as valid constraints.
+    /// TODO: if == relation used, should return some error in the THEN block
+    fn check_key_constraint(&self, first_account: &Expr<'_>, second_account: &Expr<'_>) -> bool {
+        for (left, right) in &self.if_statements {
+            if_chain! {
+                if let ExprKind::MethodCall(path_seg_left, exprs_left, _span) = left.kind;
+                if let ExprKind::MethodCall(path_seg_right, exprs_right, _span) = right.kind;
+                if path_seg_left.ident.name.as_str() == "key" && path_seg_right.ident.name.as_str() == "key";
+                if !exprs_left.is_empty() && !exprs_right.is_empty();
+                let mut spanless_eq = SpanlessEq::new(self.cx);
+                if (spanless_eq.eq_expr(&exprs_left[0], first_account) && spanless_eq.eq_expr(&exprs_right[0], second_account)) 
+                || (spanless_eq.eq_expr(&exprs_left[0], second_account) && spanless_eq.eq_expr(&exprs_right[0], first_account));
+                then {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
 }
 
-impl<'cx, 'tcx> Visitor<'tcx> for AccountUses<'cx, 'tcx> {
+impl<'cx, 'tcx> Visitor<'tcx> for Values<'cx, 'tcx> {
     fn visit_expr(&mut self, expr: &'tcx Expr<'tcx>) {
         if_chain! {
             // get mutable reference expressions
@@ -137,44 +146,58 @@ impl<'cx, 'tcx> Visitor<'tcx> for AccountUses<'cx, 'tcx> {
             if let Some(adt_def) = account_type.ty_adt_def();
             then {
                 let def_id = adt_def.did();
-                if let Some(exprs) = self.uses.get_mut(&def_id) {
+                if let Some(exprs) = self.accounts.get_mut(&def_id) {
                     let mut spanless_eq = SpanlessEq::new(self.cx);
                     // check that expr is not a duplicate within its particular key-pair
                     if exprs.iter().all(|e| !spanless_eq.eq_expr(e, mut_expr)) {
                         exprs.push(mut_expr);
                     }
                 } else {
-                    self.uses.insert(def_id, vec![mut_expr]);
+                    self.accounts.insert(def_id, vec![mut_expr]);
                 }
             }
         }
-        walk_expr(self, expr);
-    }
-}
 
-/// Performs a walk on `body`, checking whether there exists an expression that contains
-/// a `key()` method call on `account_expr`.
-fn contains_key_call<'tcx>(
-    cx: &LateContext<'tcx>,
-    body: &'tcx Body<'tcx>,
-    account_expr: &Expr<'tcx>,
-) -> bool {
-    visit_expr_no_bodies(&body.value, |expr| {
+        // get if statements
         if_chain! {
-            if let ExprKind::MethodCall(path_seg, exprs, _span) = expr.kind;
-            if path_seg.ident.name.as_str() == "key";
-            if !exprs.is_empty();
-            let mut spanless_eq = SpanlessEq::new(cx);
-            if spanless_eq.eq_expr(&exprs[0], account_expr);
+            if let ExprKind::If(wrapped_if_expr, then, _else_opt) = expr.kind;
+            if let ExprKind::DropTemps(if_expr) = wrapped_if_expr.kind;
+            if let ExprKind::Binary(op, left, right) = if_expr.kind;
+            // TODO: leaves out || or &&. Could implement something that pulls apart
+            // an if expr that is of this form into individual == or != comparisons
+            if let BinOpKind::Ne | BinOpKind::Eq = op.node;
             then {
-                true
-            } else {
-                false
+                // println!("{:#?}, {:#?}", expr, then);
+                self.if_statements.push((left, right));
             }
         }
-    })
+        walk_expr(self, expr);
+    }
 }
 
+// /// Performs a walk on `body`, checking whether there exists an expression that contains
+// /// a `key()` method call on `account_expr`.
+// fn contains_key_call<'tcx>(
+//     cx: &LateContext<'tcx>,
+//     body: &'tcx Body<'tcx>,
+//     account_expr: &Expr<'tcx>,
+// ) -> bool {
+//     visit_expr_no_bodies(&body.value, |expr| {
+//         if_chain! {
+//             if let ExprKind::MethodCall(path_seg, exprs, _span) = expr.kind;
+//             if path_seg.ident.name.as_str() == "key";
+//             if !exprs.is_empty();
+//             let mut spanless_eq = SpanlessEq::new(cx);
+//             if spanless_eq.eq_expr(&exprs[0], account_expr);
+//             then {
+//                 true
+//             } else {
+//                 false
+//             }
+//         }
+//     })
+// }
+
 #[test]
 fn insecure() {
     dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "insecure");
diff --git a/lints/dup_mutable_accounts_2/ui/secure/src/lib.rs b/lints/dup_mutable_accounts_2/ui/secure/src/lib.rs
index b637022..0f62931 100644
--- a/lints/dup_mutable_accounts_2/ui/secure/src/lib.rs
+++ b/lints/dup_mutable_accounts_2/ui/secure/src/lib.rs
@@ -14,6 +14,11 @@ pub mod duplicate_mutable_accounts_secure {
         if ctx.accounts.user_a.key() == ctx.accounts.user_b.key() {
             return Err(ProgramError::InvalidArgument);
         }
+
+        // if ctx.accounts.user_a.key() != ctx.accounts.user_b.key() {
+        //     // do program stuff
+        // }
+
         let user_a = &mut ctx.accounts.user_a;
         let user_b = &mut ctx.accounts.user_b;
 

From 14e850e138fb949c70ba437ec4faee8eff79b7f8 Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Tue, 19 Jul 2022 13:00:45 -0500
Subject: [PATCH 13/24] merge lint-6v2 into lint-6v1, creating single lint

---
 .../src/alternate_constraint.rs               | 107 ++++++
 .../src/anchor_constraint.rs                  | 118 ++++++
 lints/duplicate-mutable-accounts/src/lib.rs   | 359 ++++--------------
 3 files changed, 295 insertions(+), 289 deletions(-)
 create mode 100644 lints/duplicate-mutable-accounts/src/alternate_constraint.rs
 create mode 100644 lints/duplicate-mutable-accounts/src/anchor_constraint.rs

diff --git a/lints/duplicate-mutable-accounts/src/alternate_constraint.rs b/lints/duplicate-mutable-accounts/src/alternate_constraint.rs
new file mode 100644
index 0000000..4771fd9
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/src/alternate_constraint.rs
@@ -0,0 +1,107 @@
+use std::collections::HashMap;
+
+use rustc_hir::{
+    def_id::DefId,
+    intravisit::{walk_expr, Visitor},
+    BinOpKind, Body, Expr, ExprKind, Mutability,
+};
+use rustc_lint::LateContext;
+use rustc_middle::ty::TyKind as MiddleTyKind;
+
+use crate::ANCHOR_ACCOUNT_GENERIC_ARG_COUNT;
+use clippy_utils::{ty::match_type, SpanlessEq};
+use if_chain::if_chain;
+use solana_lints::paths;
+
+pub struct Values<'cx, 'tcx> {
+    cx: &'cx LateContext<'tcx>,
+    pub accounts: HashMap<DefId, Vec<&'tcx Expr<'tcx>>>,
+    pub if_statements: Vec<(&'tcx Expr<'tcx>, &'tcx Expr<'tcx>)>,
+}
+
+impl<'cx, 'tcx> Values<'cx, 'tcx> {
+    pub fn new(cx: &'cx LateContext<'tcx>) -> Self {
+        Values {
+            cx,
+            accounts: HashMap::new(),
+            if_statements: Vec::new(),
+        }
+    }
+
+    pub fn get_referenced_accounts_and_if_statements(&mut self, body: &'tcx Body<'tcx>) -> &Self {
+        self.visit_expr(&body.value);
+        self
+    }
+
+    /// Checks if there is a valid key constraint for `first_account` and `second_account`.
+    /// NOTE: currently only considers `first.key() == second.key()` or the symmetric relation as valid constraints.
+    /// TODO: if == relation used, should return some error in the THEN block
+    pub fn check_key_constraint(
+        &self,
+        first_account: &Expr<'_>,
+        second_account: &Expr<'_>,
+    ) -> bool {
+        for (left, right) in &self.if_statements {
+            if_chain! {
+                if let ExprKind::MethodCall(path_seg_left, exprs_left, _span) = left.kind;
+                if let ExprKind::MethodCall(path_seg_right, exprs_right, _span) = right.kind;
+                if path_seg_left.ident.name.as_str() == "key" && path_seg_right.ident.name.as_str() == "key";
+                if !exprs_left.is_empty() && !exprs_right.is_empty();
+                let mut spanless_eq = SpanlessEq::new(self.cx);
+                if (spanless_eq.eq_expr(&exprs_left[0], first_account) && spanless_eq.eq_expr(&exprs_right[0], second_account))
+                || (spanless_eq.eq_expr(&exprs_left[0], second_account) && spanless_eq.eq_expr(&exprs_right[0], first_account));
+                then {
+                    return true;
+                }
+            }
+        }
+        false
+    }
+}
+
+impl<'cx, 'tcx> Visitor<'tcx> for Values<'cx, 'tcx> {
+    fn visit_expr(&mut self, expr: &'tcx Expr<'tcx>) {
+        if_chain! {
+            // get mutable reference expressions
+            if let ExprKind::AddrOf(_, mutability, mut_expr) = expr.kind;
+            if let Mutability::Mut = mutability;
+            // check type of expr == Account<'info, T>
+            let middle_ty = self.cx.typeck_results().expr_ty(mut_expr);
+            // let mut_expr_def_id = self.cx.tcx.hir().local_def_id(mut_expr.hir_id).to_def_id();
+            // let middle_ty = self.cx.tcx.type_of(mut_expr_def_id);
+            if match_type(self.cx, middle_ty, &paths::ANCHOR_ACCOUNT);
+            // grab T generic parameter
+            if let MiddleTyKind::Adt(_adt_def, substs) = middle_ty.kind();
+            if substs.len() == ANCHOR_ACCOUNT_GENERIC_ARG_COUNT;
+            let account_type = substs[1].expect_ty();
+            if let Some(adt_def) = account_type.ty_adt_def();
+            then {
+                let def_id = adt_def.did();
+                if let Some(exprs) = self.accounts.get_mut(&def_id) {
+                    let mut spanless_eq = SpanlessEq::new(self.cx);
+                    // check that expr is not a duplicate within its particular key-pair
+                    if exprs.iter().all(|e| !spanless_eq.eq_expr(e, mut_expr)) {
+                        exprs.push(mut_expr);
+                    }
+                } else {
+                    self.accounts.insert(def_id, vec![mut_expr]);
+                }
+            }
+        }
+
+        // get if statements
+        if_chain! {
+            if let ExprKind::If(wrapped_if_expr, _then, _else_opt) = expr.kind;
+            if let ExprKind::DropTemps(if_expr) = wrapped_if_expr.kind;
+            if let ExprKind::Binary(op, left, right) = if_expr.kind;
+            // TODO: leaves out || or &&. Could implement something that pulls apart
+            // an if expr that is of this form into individual == or != comparisons
+            if let BinOpKind::Ne | BinOpKind::Eq = op.node;
+            then {
+                // println!("{:#?}, {:#?}", expr, then);
+                self.if_statements.push((left, right));
+            }
+        }
+        walk_expr(self, expr);
+    }
+}
diff --git a/lints/duplicate-mutable-accounts/src/anchor_constraint.rs b/lints/duplicate-mutable-accounts/src/anchor_constraint.rs
new file mode 100644
index 0000000..a6fad9c
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/src/anchor_constraint.rs
@@ -0,0 +1,118 @@
+use std::default::Default;
+
+use rustc_ast::{
+    token::{Delimiter, Token, TokenKind},
+    tokenstream::{DelimSpan, TokenStream, TokenTree, TreeAndSpacing},
+};
+use rustc_hir::{def::Res, FieldDef, GenericArg, QPath, TyKind};
+use rustc_span::{
+    def_id::DefId,
+    symbol::{Ident, Symbol},
+    DUMMY_SP,
+};
+
+use crate::ANCHOR_ACCOUNT_GENERIC_ARG_COUNT;
+use if_chain::if_chain;
+
+/// Returns the `DefId` of the anchor account type, ie, `T` in `Account<'info, T>`.
+/// Returns `None` if the type of `field` is not an anchor account.
+pub fn get_anchor_account_type_def_id(field: &FieldDef) -> Option<DefId> {
+    if_chain! {
+        if let TyKind::Path(qpath) = &field.ty.kind;
+        if let QPath::Resolved(_, path) = qpath;
+        if !path.segments.is_empty();
+        if let Some(generic_args) = path.segments[0].args;
+        if generic_args.args.len() == ANCHOR_ACCOUNT_GENERIC_ARG_COUNT;
+        if let GenericArg::Type(hir_ty) = &generic_args.args[1];
+        then {
+            get_def_id(hir_ty)
+        } else {
+            None
+        }
+    }
+}
+
+/// Returns the `DefId` of `ty`, an hir type. Returns `None` if cannot resolve type.
+pub fn get_def_id(ty: &rustc_hir::Ty) -> Option<DefId> {
+    if_chain! {
+        if let TyKind::Path(qpath) = &ty.kind;
+        if let QPath::Resolved(_, path) = qpath;
+        if let Res::Def(_, def_id) = path.res;
+        then {
+            Some(def_id)
+        } else {
+            None
+        }
+    }
+}
+
+/// Returns a `TokenStream` of form: `a`.key() != `b`.key().
+pub fn create_key_check_constraint_tokenstream(a: Symbol, b: Symbol) -> TokenStream {
+    // TODO: may be more efficient way to do this, since the stream is effectively fixed
+    // and determined. Only two tokens are variable.
+    let constraint = vec![
+        TreeAndSpacing::from(create_token_from_ident(a.as_str())),
+        TreeAndSpacing::from(TokenTree::Token(Token::new(TokenKind::Dot, DUMMY_SP))),
+        TreeAndSpacing::from(create_token_from_ident("key")),
+        TreeAndSpacing::from(TokenTree::Delimited(
+            DelimSpan::dummy(),
+            Delimiter::Parenthesis,
+            TokenStream::new(vec![]),
+        )),
+        TreeAndSpacing::from(TokenTree::Token(Token::new(TokenKind::Ne, DUMMY_SP))),
+        TreeAndSpacing::from(create_token_from_ident(b.as_str())),
+        TreeAndSpacing::from(TokenTree::Token(Token::new(TokenKind::Dot, DUMMY_SP))),
+        TreeAndSpacing::from(create_token_from_ident("key")),
+        TreeAndSpacing::from(TokenTree::Delimited(
+            DelimSpan::dummy(),
+            Delimiter::Parenthesis,
+            TokenStream::new(vec![]),
+        )),
+    ];
+
+    TokenStream::new(constraint)
+}
+
+/// Returns a `TokenTree::Token` which has `TokenKind::Ident`, with the string set to `s`.
+fn create_token_from_ident(s: &str) -> TokenTree {
+    let ident = Ident::from_str(s);
+    TokenTree::Token(Token::from_ast_ident(ident))
+}
+
+#[derive(Debug, Default)]
+pub struct Streams(pub Vec<TokenStream>);
+
+impl Streams {
+    /// Returns true if `self` has a TokenStream that `other` is a substream of
+    pub fn contains(&self, other: &TokenStream) -> bool {
+        self.0
+            .iter()
+            .any(|token_stream| Self::is_substream(token_stream, other))
+    }
+
+    /// Returns true if `other` is a substream of `stream`. By substream we mean in the
+    /// sense of a substring.
+    // NOTE: a possible optimization is when a match is found, to remove the matched
+    // TokenTrees from the TokenStream, since the constraint has been "checked" so it never
+    // needs to be validated again. This cuts down the number of comparisons.
+    fn is_substream(stream: &TokenStream, other: &TokenStream) -> bool {
+        let other_len = other.len();
+        for i in 0..stream.len() {
+            for (j, other_token) in other.trees().enumerate() {
+                match stream.trees().nth(i + j) {
+                    Some(token_tree) => {
+                        if !token_tree.eq_unspanned(other_token) {
+                            break;
+                        }
+                        // reached last index, so we have a match
+                        if j == other_len - 1 {
+                            return true;
+                        }
+                    }
+                    None => return false, // reached end of stream
+                }
+            }
+        }
+        false
+    }
+}
diff --git a/lints/duplicate-mutable-accounts/src/lib.rs b/lints/duplicate-mutable-accounts/src/lib.rs
index 669d644..3f31f83 100644
--- a/lints/duplicate-mutable-accounts/src/lib.rs
+++ b/lints/duplicate-mutable-accounts/src/lib.rs
@@ -3,23 +3,22 @@
 
 extern crate rustc_ast;
 extern crate rustc_hir;
+extern crate rustc_middle;
 extern crate rustc_span;
 
+mod alternate_constraint;
+mod anchor_constraint;
+
+use crate::alternate_constraint::*;
+use crate::anchor_constraint::*;
+
 use std::collections::{HashMap, VecDeque};
 use std::default::Default;
 
-use rustc_ast::{
-    token::{Delimiter, Token, TokenKind},
-    tokenstream::{DelimSpan, TokenStream, TokenTree, TreeAndSpacing},
-    AttrKind, Attribute, MacArgs,
-};
-use rustc_hir::{def::Res, FieldDef, GenericArg, QPath, TyKind, VariantData};
+use rustc_ast::{AttrKind, Attribute, MacArgs};
+use rustc_hir::{intravisit::FnKind, Body, FnDecl, HirId, VariantData};
 use rustc_lint::{LateContext, LateLintPass};
-use rustc_span::{
-    def_id::DefId,
-    symbol::{Ident, Symbol},
-    Span, DUMMY_SP,
-};
+use rustc_span::{def_id::DefId, symbol::Symbol, Span};
 
 use clippy_utils::{diagnostics::span_lint_and_help, ty::match_type};
 use if_chain::if_chain;
@@ -53,6 +52,7 @@ dylint_linting::impl_late_lint! {
 struct DuplicateMutableAccounts {
     accounts: HashMap<DefId, Vec<(Symbol, Span)>>,
     streams: Streams,
+    spans: Vec<(Span, Span)>,
 }
 
 impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
@@ -88,302 +88,83 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
         }
     }
 
-    fn check_crate_post(&mut self, cx: &LateContext<'tcx>) {
-        // println!("{:#?}", self);
-        for v in self.accounts.values() {
-            if v.len() > 1 {
-                let mut deq = VecDeque::from(v.to_owned());
-                for _ in 0..deq.len() - 1 {
-                    let (first, first_span) = deq.pop_front().unwrap();
-                    for (other, other_span) in &deq {
-                        let stream = create_key_check_constraint_tokenstream(first, *other);
-                        let symmetric_stream =
-                            create_key_check_constraint_tokenstream(*other, first);
-
-                        if !(self.streams.contains(&stream)
-                            || self.streams.contains(&symmetric_stream))
-                        {
-                            span_lint_and_help(
-                                cx,
-                                DUPLICATE_MUTABLE_ACCOUNTS,
-                                first_span,
-                                &format!("{} and {} have identical account types but do not have a key check constraint", first, other),
-                                Some(*other_span),
-                                &format!("add an anchor key check constraint: #[account(constraint = {}.key() != {}.key())]", first, other)
-                            );
+    fn check_fn(
+        &mut self,
+        cx: &LateContext<'tcx>,
+        _: FnKind<'tcx>,
+        _: &'tcx FnDecl<'tcx>,
+        body: &'tcx Body<'tcx>,
+        span: Span,
+        _: HirId,
+    ) {
+        if !span.from_expansion() {
+            // get all mutable references to Accounts and if_statements in body
+            let mut values = Values::new(cx);
+            values.get_referenced_accounts_and_if_statements(body);
+
+            // NOTE: could do this check in check_post_crate if exprs are replaced with HirId, then use
+            // the HirId to fetch the expr
+            values.accounts.values().for_each(|exprs| {
+                if exprs.len() > 1 {
+                    for current in 0..exprs.len() - 1 {
+                        for next in current + 1..exprs.len() {
+                            if !values.check_key_constraint(exprs[current], exprs[next]) {
+                                // store for later spanning
+                                self.spans.push((exprs[current].span, exprs[next].span));
+                            }
                         }
                     }
                 }
-            }
-        } else {
-            // perform alternate constraint check, e.g., check fn bodies, then check key checks
-            self.check_fn()
+            });
         }
+    }
 
-        // TODO: how to enforce that this is only called when necessary?
-        fn check_fn(
-            &mut self,
-            cx: &LateContext<'tcx>,
-            _: FnKind<'tcx>,
-            _: &'tcx FnDecl<'tcx>,
-            body: &'tcx Body<'tcx>,
-            span: Span,
-            _: HirId,
-        ) {
-            if !span.from_expansion() {
-                let accounts = get_referenced_accounts(cx, body);
-                
-                accounts.values().for_each(|exprs| {
-                    // TODO: figure out handling of >2 accounts
-                    match exprs.len() {
-                        2 => {
-                            let first = exprs[0];
-                            let second = exprs[1];
-                            if !contains_key_call(cx, body, first) {
-                                span_lint_and_help(
-                                    cx,
-                                    DUP_MUTABLE_ACCOUNTS_2,
-                                    first.span,
-                                    "this expression does not have a key check but has the same account type as another expression",
-                                    Some(second.span),
-                                    "add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()",
-                                );
-                            }
-                            if !contains_key_call(cx, body, second) {
+    fn check_crate_post(&mut self, cx: &LateContext<'tcx>) {
+        // if collected some anchor macro constraints then perform v1 lint
+        if !self.streams.0.is_empty() {
+            for v in self.accounts.values() {
+                if v.len() > 1 {
+                    let mut deq = VecDeque::from(v.to_owned());
+                    for _ in 0..deq.len() - 1 {
+                        let (first, first_span) = deq.pop_front().unwrap();
+                        for (other, other_span) in &deq {
+                            let stream = create_key_check_constraint_tokenstream(first, *other);
+                            let symmetric_stream =
+                                create_key_check_constraint_tokenstream(*other, first);
+
+                            if !(self.streams.contains(&stream)
+                                || self.streams.contains(&symmetric_stream))
+                            {
                                 span_lint_and_help(
                                     cx,
-                                    DUP_MUTABLE_ACCOUNTS_2,
-                                    second.span,
-                                    "this expression does not have a key check but has the same account type as another expression",
-                                    Some(first.span),
-                                    "add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()",
+                                    DUPLICATE_MUTABLE_ACCOUNTS,
+                                    first_span,
+                                    &format!("{} and {} have identical account types but do not have a key check constraint", first, other),
+                                    Some(*other_span),
+                                    &format!("add an anchor key check constraint: #[account(constraint = {}.key() != {}.key())]", first, other)
                                 );
                             }
-                        },
-                        n if n > 2 => {
-                            span_lint_and_note(
-                                cx,
-                                DUP_MUTABLE_ACCOUNTS_2,
-                                exprs[0].span,
-                                &format!("the following expression has the same account type as {} other accounts", exprs.len()),
-                                None,
-                                "might not check that each account has a unique key"
-                            )
-                        },
-                        _ => {}
-                    }
-                });
-            }
-        }
-    }
-}
-
-mod anchor_constraint_check {
-    /// Returns the `DefId` of the anchor account type, ie, `T` in `Account<'info, T>`.
-    /// Returns `None` if the type of `field` is not an anchor account.
-    fn get_anchor_account_type_def_id(field: &FieldDef) -> Option<DefId> {
-        if_chain! {
-            if let TyKind::Path(qpath) = &field.ty.kind;
-            if let QPath::Resolved(_, path) = qpath;
-            if !path.segments.is_empty();
-            if let Some(generic_args) = path.segments[0].args;
-            if generic_args.args.len() == ANCHOR_ACCOUNT_GENERIC_ARG_COUNT;
-            if let GenericArg::Type(hir_ty) = &generic_args.args[1];
-            then {
-                get_def_id(hir_ty)
-            } else {
-                None
-            }
-        }
-    }
-
-    /// Returns the `DefId` of `ty`, an hir type. Returns `None` if cannot resolve type.
-    fn get_def_id(ty: &rustc_hir::Ty) -> Option<DefId> {
-        if_chain! {
-            if let TyKind::Path(qpath) = &ty.kind;
-            if let QPath::Resolved(_, path) = qpath;
-            if let Res::Def(_, def_id) = path.res;
-            then {
-                Some(def_id)
-            } else {
-                None
-            }
-        }
-    }
-
-/// Returns a `TokenStream` of form: `a`.key() != `b`.key().
-fn create_key_check_constraint_tokenstream(a: Symbol, b: Symbol) -> TokenStream {
-    // TODO: may be more efficient way to do this, since the stream is effectively fixed
-    // and determined. Only two tokens are variable.
-    let constraint = vec![
-        TreeAndSpacing::from(create_token_from_ident(a.as_str())),
-        TreeAndSpacing::from(TokenTree::Token(Token::new(TokenKind::Dot, DUMMY_SP))),
-        TreeAndSpacing::from(create_token_from_ident("key")),
-        TreeAndSpacing::from(TokenTree::Delimited(
-            DelimSpan::dummy(),
-            Delimiter::Parenthesis,
-            TokenStream::new(vec![]),
-        )),
-        TreeAndSpacing::from(TokenTree::Token(Token::new(TokenKind::Ne, DUMMY_SP))),
-        TreeAndSpacing::from(create_token_from_ident(b.as_str())),
-        TreeAndSpacing::from(TokenTree::Token(Token::new(TokenKind::Dot, DUMMY_SP))),
-        TreeAndSpacing::from(create_token_from_ident("key")),
-        TreeAndSpacing::from(TokenTree::Delimited(
-            DelimSpan::dummy(),
-            Delimiter::Parenthesis,
-            TokenStream::new(vec![]),
-        )),
-    ];
-
-        TokenStream::new(constraint)
-    }
-
-    /// Returns a `TokenTree::Token` which has `TokenKind::Ident`, with the string set to `s`.
-    fn create_token_from_ident(s: &str) -> TokenTree {
-        let ident = Ident::from_str(s);
-        TokenTree::Token(Token::from_ast_ident(ident))
-    }
-
-    #[derive(Debug, Default)]
-    pub struct Streams(Vec<TokenStream>);
-
-    impl Streams {
-        /// Returns true if `self` contains `other`, by comparing if there is an
-        /// identical `TokenStream` in `self` regardless of span.
-        fn contains(&self, other: &TokenStream) -> bool {
-            self.0.iter().any(|stream| stream.eq_unspanned(other))
-        }
-    }
-}
-
-
-impl Streams {
-    /// Returns true if `self` has a TokenStream that `other` is a substream of
-    fn contains(&self, other: &TokenStream) -> bool {
-        self.0
-            .iter()
-            .any(|token_stream| Self::is_substream(token_stream, other))
-    }
-
-    /// Returns true if `other` is a substream of `stream`. By substream we mean in the
-    /// sense of a substring.
-    // NOTE: a possible optimization is when a match is found, to remove the matched
-    // TokenTrees from the TokenStream, since the constraint has been "checked" so it never
-    // needs to be validated again. This cuts down the number of comparisons.
-    fn is_substream(stream: &TokenStream, other: &TokenStream) -> bool {
-        let other_len = other.len();
-        for i in 0..stream.len() {
-            for (j, other_token) in other.trees().enumerate() {
-                match stream.trees().nth(i + j) {
-                    Some(token_tree) => {
-                        if !token_tree.eq_unspanned(other_token) {
-                            break;
-                        }
-                        // reached last index, so we have a match
-                        if j == other_len - 1 {
-                            return true;
                         }
                     }
-                    None => return false, // reached end of stream
                 }
             }
-        }
-        false
-    }
-}
-
-mod alternate_constraint_check {
-    struct AccountUses<'cx, 'tcx> {
-        cx: &'cx LateContext<'tcx>,
-        uses: HashMap<DefId, Vec<&'tcx Expr<'tcx>>>,
-    }
-    
-    fn get_referenced_accounts<'tcx>(
-        cx: &LateContext<'tcx>,
-        body: &'tcx Body<'tcx>,
-    ) -> HashMap<DefId, Vec<&'tcx Expr<'tcx>>> {
-        let mut accounts = AccountUses {
-            cx,
-            uses: HashMap::new(),
-        };
-    
-        accounts.visit_expr(&body.value);
-        accounts.uses
-    }
-    
-    impl<'cx, 'tcx> Visitor<'tcx> for AccountUses<'cx, 'tcx> {
-        fn visit_expr(&mut self, expr: &'tcx Expr<'tcx>) {
-            if_chain! {
-                // get mutable reference expressions
-                if let ExprKind::AddrOf(_, mutability, mut_expr) = expr.kind;
-                if let Mutability::Mut = mutability;
-                // check type of expr == Account<'info, T>
-                let middle_ty = self.cx.typeck_results().expr_ty(mut_expr);
-                if match_type(self.cx, middle_ty, &paths::ANCHOR_ACCOUNT);
-                // grab T generic parameter
-                if let TyKind::Adt(_adt_def, substs) = middle_ty.kind();
-                if substs.len() == ANCHOR_ACCOUNT_GENERIC_ARG_COUNT;
-                let account_type = substs[1].expect_ty(); // TODO: could just store middle::Ty instead of DefId?
-                if let Some(adt_def) = account_type.ty_adt_def();
-                then {
-                    let def_id = adt_def.did();
-                    if let Some(exprs) = self.uses.get_mut(&def_id) {
-                        let mut spanless_eq = SpanlessEq::new(self.cx);
-                        // check that expr is not a duplicate within its particular key-pair
-                        if exprs.iter().all(|e| !spanless_eq.eq_expr(e, mut_expr)) {
-                            exprs.push(mut_expr);
-                        }
-                    } else {
-                        self.uses.insert(def_id, vec![mut_expr]);
-                    }
-                }
+        } else {
+            // TODO: Not a fan of having it span lints for this check when there are no checks whatsoever.
+            // I'd rather have it span lints to recommended anchor macros, if no checks are found at all
+            for (first, second) in &self.spans {
+                span_lint_and_help(
+                    cx,
+                    DUPLICATE_MUTABLE_ACCOUNTS,
+                    *first,
+                    "the following expressions have equivalent Account types, yet do not contain a proper key check.",
+                    Some(*second),
+                    "add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()",
+                );
             }
-            walk_expr(self, expr);
         }
     }
-    
-    /// Performs a walk on `body`, checking whether there exists an expression that contains
-    /// a `key()` method call on `account_expr`.
-    fn contains_key_call<'tcx>(
-        cx: &LateContext<'tcx>,
-        body: &'tcx Body<'tcx>,
-        account_expr: &Expr<'tcx>,
-    ) -> bool {
-        visit_expr_no_bodies(&body.value, |expr| {
-            if_chain! {
-                if let ExprKind::MethodCall(path_seg, exprs, _span) = expr.kind;
-                if path_seg.ident.name.as_str() == "key";
-                if !exprs.is_empty();
-                let mut spanless_eq = SpanlessEq::new(cx);
-                if spanless_eq.eq_expr(&exprs[0], account_expr);
-                then {
-                    true
-                } else {
-                    false
-                }
-            }
-        })
-    }
 }
 
-// /// Splits `stream` into a vector of substreams, separated by `delimiter`.
-// fn split(stream: CursorRef, delimiter: TokenKind) -> Vec<TokenStream> {
-//     let mut split_streams: Vec<TokenStream> = Vec::new();
-//     let mut temp: Vec<TreeAndSpacing> = Vec::new();
-//     let delim = TokenTree::Token(Token::new(delimiter, DUMMY_SP));
-
-//     stream.for_each(|t| {
-//         if t.eq_unspanned(&delim) {
-//             split_streams.push(TokenStream::new(temp.clone()));
-//             temp.clear();
-//         } else {
-//             temp.push(TreeAndSpacing::from(t.clone()));
-//         }
-//     });
-//     split_streams.push(TokenStream::new(temp));
-//     split_streams
-// }
-
 #[test]
 fn insecure() {
     dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "insecure");

From af02a30605c2f96005a48b889112cbe00567cb2c Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Tue, 19 Jul 2022 14:12:38 -0500
Subject: [PATCH 14/24] fix lint-6 tests and add readme

---
 lints/duplicate-mutable-accounts/README.md    | 47 ++++++++++++++++++
 lints/duplicate-mutable-accounts/src/lib.rs   | 43 +++++++++++++----
 .../ui/insecure-2/src/lib.rs                  |  3 ++
 .../ui/insecure-2/src/lib.stderr              | 48 +++++++++----------
 .../ui/insecure/src/lib.stderr                | 16 +++----
 5 files changed, 117 insertions(+), 40 deletions(-)
 create mode 100644 lints/duplicate-mutable-accounts/README.md

diff --git a/lints/duplicate-mutable-accounts/README.md b/lints/duplicate-mutable-accounts/README.md
new file mode 100644
index 0000000..7f9e941
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/README.md
@@ -0,0 +1,47 @@
+# duplicate_mutable_accounts
+
+**What it does:** Checks to make sure there is a key check on identical Anchor accounts.
+The key check serves to make sure that two identical accounts do not have the same key,
+ie, they are unique. An Anchor account (`Account<'info, T>`) is identical to another if 
+the generic parameter `T` is the same type for each account.
+
+**Why is this bad?** If a program contains two identical, mutable Anchor accounts, and
+performs some operation on those accounts, then a user could pass in the same account
+twice. Then any previous operations may be overwritten by the last operation, which may
+not be what the program wanted if it expected different accounts.
+
+**Known problems:** If a program is not using the anchor `#[account]` macro constraints,
+and is instead using checks in the function bodies, and the program uses boolean operator
+&& or || to link constraints in a single if statement, the lint will flag this as a false
+positive since the lint only catches statements with `==` or `!=`.
+
+Another issue is if a program uses an if statement such as `a.key() == b.key()` and then
+continues to modify the accounts, then this will not be caught. The reason is because the
+lint regards expressions with `==` as a secure check, since it assumes the program will
+then return an error (see the secure example). However, it does not explicitly check that
+an error is returned.
+
+In general, this lint will catch all vulnerabilities if the anchor macro constraints are
+used (see the recommended example). It is not as robust if alternative methods are utilized.
+Thus it is encouraged to use the anchor `#[account]` macro constraints.
+
+**Example:**
+
+```rust
+#[derive(Accounts)]
+pub struct Update<'info> {
+    user_a: Account<'info, User>,
+    user_b: Account<'info, User>,
+}
+```
+
+Use instead:
+
+```rust
+#[derive(Accounts)]
+pub struct Update<'info> {
+    #[account(constraint = user_a.key() != user_b.key())]
+    user_a: Account<'info, User>,
+    user_b: Account<'info, User>,
+}
+```
diff --git a/lints/duplicate-mutable-accounts/src/lib.rs b/lints/duplicate-mutable-accounts/src/lib.rs
index 3f31f83..60c16b1 100644
--- a/lints/duplicate-mutable-accounts/src/lib.rs
+++ b/lints/duplicate-mutable-accounts/src/lib.rs
@@ -27,24 +27,51 @@ use solana_lints::paths;
 const ANCHOR_ACCOUNT_GENERIC_ARG_COUNT: usize = 2;
 
 dylint_linting::impl_late_lint! {
-    /// **What it does:**
+    /// **What it does:** Checks to make sure there is a key check on identical Anchor accounts.
+    /// The key check serves to make sure that two identical accounts do not have the same key,
+    /// ie, they are unique. An Anchor account (`Account<'info, T>`) is identical to another if 
+    /// the generic parameter `T` is the same type for each account.
     ///
-    /// **Why is this bad?**
+    /// **Why is this bad?** If a program contains two identical, mutable Anchor accounts, and
+    /// performs some operation on those accounts, then a user could pass in the same account
+    /// twice. Then any previous operations may be overwritten by the last operation, which may
+    /// not be what the program wanted if it expected different accounts.
     ///
-    /// **Known problems:** None.
+    /// **Known problems:** If a program is not using the anchor #[account] macro constraints,
+    /// and is instead using checks in the function bodies, and the program uses boolean operator
+    /// && or || to link constraints in a single if statement, the lint will flag this as a false
+    /// positive since the lint only catches statements with `==` or `!=`.
+    /// Another issue is if a program uses an if statement such as `a.key() == b.key()` and then
+    /// continues to modify the accounts, then this will not be caught. The reason is because the
+    /// lint regards expressions with `==` as a secure check, since it assumes the program will
+    /// then return an error (see the secure example). However, it does not explicitly check that
+    /// an error is returned.
+    /// 
+    /// In general, this lint will catch all vulnerabilities if the anchor macro constraints are
+    /// used (see the recommended example). It is not as robust if alternative methods are utilized.
+    /// Thus it is encouraged to use the anchor `#[account]` macro constraints.
     ///
-    /// **Example:**
+    /// **Example:** 
     ///
     /// ```rust
-    /// // example code where a warning is issued
+    /// #[derive(Accounts)]
+    /// pub struct Update<'info> {
+    ///     user_a: Account<'info, User>,
+    ///     user_b: Account<'info, User>,
+    /// }
     /// ```
     /// Use instead:
     /// ```rust
-    /// // example code that does not raise a warning
+    /// #[derive(Accounts)]
+    /// pub struct Update<'info> {
+    ///     #[account(constraint = user_a.key() != user_b.key())]
+    ///     user_a: Account<'info, User>,
+    ///     user_b: Account<'info, User>,
+    /// }
     /// ```
     pub DUPLICATE_MUTABLE_ACCOUNTS,
     Warn,
-    "description goes here",
+    "does not check if multiple identical Anchor accounts have different keys",
     DuplicateMutableAccounts::default()
 }
 
@@ -156,7 +183,7 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
                     cx,
                     DUPLICATE_MUTABLE_ACCOUNTS,
                     *first,
-                    "the following expressions have equivalent Account types, yet do not contain a proper key check.",
+                    &format!("the expressions on line {:?} and {:?} have identical Account types, yet do not contain a proper key check.", first, second),
                     Some(*second),
                     "add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()",
                 );
diff --git a/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.rs b/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.rs
index 0bd77a5..1ab1576 100644
--- a/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.rs
+++ b/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.rs
@@ -10,12 +10,15 @@ pub mod duplicate_mutable_accounts_insecure {
         ctx: Context<Update>,
         a: u64,
         b: u64,
+        c: u64,
     ) -> anchor_lang::solana_program::entrypoint::ProgramResult {
         let user_a = &mut ctx.accounts.user_a;
         let user_b = &mut ctx.accounts.user_b;
+        let user_c = &mut ctx.accounts.user_c;
 
         user_a.data = a;
         user_b.data = b;
+        user_c.data = c;
         Ok(())
     }
 }
diff --git a/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.stderr b/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.stderr
index 94e9791..06a1eca 100644
--- a/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.stderr
+++ b/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.stderr
@@ -1,39 +1,39 @@
-error: user_a and user_b have identical account types but do not have a key check constraint
-  --> $DIR/lib.rs:25:5
+error: the expressions on line $DIR/lib.rs:15:27: 15:46 (#0) and $DIR/lib.rs:16:27: 16:46 (#0) have identical Account types, yet do not contain a proper key check.
+  --> $DIR/lib.rs:15:27
    |
-LL |     user_a: Account<'info, User>,
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |         let user_a = &mut ctx.accounts.user_a;
+   |                           ^^^^^^^^^^^^^^^^^^^
    |
    = note: `-D duplicate-mutable-accounts` implied by `-D warnings`
-help: add an anchor key check constraint: #[account(constraint = user_a.key() != user_b.key())]
-  --> $DIR/lib.rs:26:5
+help: add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()
+  --> $DIR/lib.rs:16:27
    |
-LL |     user_b: Account<'info, User>,
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |         let user_b = &mut ctx.accounts.user_b;
+   |                           ^^^^^^^^^^^^^^^^^^^
 
-error: user_a and user_c have identical account types but do not have a key check constraint
-  --> $DIR/lib.rs:25:5
+error: the expressions on line $DIR/lib.rs:15:27: 15:46 (#0) and $DIR/lib.rs:17:27: 17:46 (#0) have identical Account types, yet do not contain a proper key check.
+  --> $DIR/lib.rs:15:27
    |
-LL |     user_a: Account<'info, User>,
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |         let user_a = &mut ctx.accounts.user_a;
+   |                           ^^^^^^^^^^^^^^^^^^^
    |
-help: add an anchor key check constraint: #[account(constraint = user_a.key() != user_c.key())]
-  --> $DIR/lib.rs:27:5
+help: add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()
+  --> $DIR/lib.rs:17:27
    |
-LL |     user_c: Account<'info, User>,
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |         let user_c = &mut ctx.accounts.user_c;
+   |                           ^^^^^^^^^^^^^^^^^^^
 
-error: user_b and user_c have identical account types but do not have a key check constraint
-  --> $DIR/lib.rs:26:5
+error: the expressions on line $DIR/lib.rs:16:27: 16:46 (#0) and $DIR/lib.rs:17:27: 17:46 (#0) have identical Account types, yet do not contain a proper key check.
+  --> $DIR/lib.rs:16:27
    |
-LL |     user_b: Account<'info, User>,
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |         let user_b = &mut ctx.accounts.user_b;
+   |                           ^^^^^^^^^^^^^^^^^^^
    |
-help: add an anchor key check constraint: #[account(constraint = user_b.key() != user_c.key())]
-  --> $DIR/lib.rs:27:5
+help: add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()
+  --> $DIR/lib.rs:17:27
    |
-LL |     user_c: Account<'info, User>,
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |         let user_c = &mut ctx.accounts.user_c;
+   |                           ^^^^^^^^^^^^^^^^^^^
 
 error: aborting due to 3 previous errors
 
diff --git a/lints/duplicate-mutable-accounts/ui/insecure/src/lib.stderr b/lints/duplicate-mutable-accounts/ui/insecure/src/lib.stderr
index 064418c..d86ec52 100644
--- a/lints/duplicate-mutable-accounts/ui/insecure/src/lib.stderr
+++ b/lints/duplicate-mutable-accounts/ui/insecure/src/lib.stderr
@@ -1,15 +1,15 @@
-error: user_a and user_b have identical account types but do not have a key check constraint
-  --> $DIR/lib.rs:25:5
+error: the expressions on line $DIR/lib.rs:14:27: 14:46 (#0) and $DIR/lib.rs:15:27: 15:46 (#0) have identical Account types, yet do not contain a proper key check.
+  --> $DIR/lib.rs:14:27
    |
-LL |     user_a: Account<'info, User>,
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |         let user_a = &mut ctx.accounts.user_a;
+   |                           ^^^^^^^^^^^^^^^^^^^
    |
    = note: `-D duplicate-mutable-accounts` implied by `-D warnings`
-help: add an anchor key check constraint: #[account(constraint = user_a.key() != user_b.key())]
-  --> $DIR/lib.rs:26:5
+help: add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()
+  --> $DIR/lib.rs:15:27
    |
-LL |     user_b: Account<'info, User>,
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |         let user_b = &mut ctx.accounts.user_b;
+   |                           ^^^^^^^^^^^^^^^^^^^
 
 error: aborting due to previous error
 

From bd2e0b970cf157dfb3755e74095f724ba1dd503b Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Tue, 19 Jul 2022 14:13:00 -0500
Subject: [PATCH 15/24] remove lint6v2

---
 .../dup_mutable_accounts_2/.cargo/config.toml |   11 -
 lints/dup_mutable_accounts_2/.gitignore       |    1 -
 lints/dup_mutable_accounts_2/Cargo.lock       | 1797 -----------------
 lints/dup_mutable_accounts_2/Cargo.toml       |   33 -
 lints/dup_mutable_accounts_2/README.md        |   19 -
 lints/dup_mutable_accounts_2/rust-toolchain   |    3 -
 lints/dup_mutable_accounts_2/src/lib.rs       |  209 --
 .../ui/insecure/Cargo.toml                    |   19 -
 .../ui/insecure/Xargo.toml                    |    2 -
 .../ui/insecure/src/lib.rs                    |   34 -
 .../ui/insecure/src/lib.stderr                |   27 -
 .../ui/secure/Cargo.lock                      | 1315 ------------
 .../ui/secure/Cargo.toml                      |   19 -
 .../ui/secure/Xargo.toml                      |    2 -
 .../ui/secure/src/lib.rs                      |   42 -
 lints/duplicate-mutable-accounts/src/lib.rs   |    6 +-
 16 files changed, 3 insertions(+), 3536 deletions(-)
 delete mode 100644 lints/dup_mutable_accounts_2/.cargo/config.toml
 delete mode 100644 lints/dup_mutable_accounts_2/.gitignore
 delete mode 100644 lints/dup_mutable_accounts_2/Cargo.lock
 delete mode 100644 lints/dup_mutable_accounts_2/Cargo.toml
 delete mode 100644 lints/dup_mutable_accounts_2/README.md
 delete mode 100644 lints/dup_mutable_accounts_2/rust-toolchain
 delete mode 100644 lints/dup_mutable_accounts_2/src/lib.rs
 delete mode 100644 lints/dup_mutable_accounts_2/ui/insecure/Cargo.toml
 delete mode 100644 lints/dup_mutable_accounts_2/ui/insecure/Xargo.toml
 delete mode 100644 lints/dup_mutable_accounts_2/ui/insecure/src/lib.rs
 delete mode 100644 lints/dup_mutable_accounts_2/ui/insecure/src/lib.stderr
 delete mode 100644 lints/dup_mutable_accounts_2/ui/secure/Cargo.lock
 delete mode 100644 lints/dup_mutable_accounts_2/ui/secure/Cargo.toml
 delete mode 100644 lints/dup_mutable_accounts_2/ui/secure/Xargo.toml
 delete mode 100644 lints/dup_mutable_accounts_2/ui/secure/src/lib.rs

diff --git a/lints/dup_mutable_accounts_2/.cargo/config.toml b/lints/dup_mutable_accounts_2/.cargo/config.toml
deleted file mode 100644
index 46d1571..0000000
--- a/lints/dup_mutable_accounts_2/.cargo/config.toml
+++ /dev/null
@@ -1,11 +0,0 @@
-[target.aarch64-apple-darwin]
-linker = "dylint-link"
-
-[target.x86_64-apple-darwin]
-linker = "dylint-link"
-
-[target.x86_64-unknown-linux-gnu]
-linker = "dylint-link"
-
-[target.x86_64-pc-windows-msvc]
-linker = "dylint-link"
diff --git a/lints/dup_mutable_accounts_2/.gitignore b/lints/dup_mutable_accounts_2/.gitignore
deleted file mode 100644
index ea8c4bf..0000000
--- a/lints/dup_mutable_accounts_2/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-/target
diff --git a/lints/dup_mutable_accounts_2/Cargo.lock b/lints/dup_mutable_accounts_2/Cargo.lock
deleted file mode 100644
index 76fde76..0000000
--- a/lints/dup_mutable_accounts_2/Cargo.lock
+++ /dev/null
@@ -1,1797 +0,0 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
-version = 3
-
-[[package]]
-name = "ahash"
-version = "0.7.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fcb51a0695d8f838b1ee009b3fbf66bda078cd64590202a864a8f3e8c4315c47"
-dependencies = [
- "getrandom 0.2.7",
- "once_cell",
- "version_check",
-]
-
-[[package]]
-name = "aho-corasick"
-version = "0.7.18"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e37cfd5e7657ada45f742d6e99ca5788580b5c529dc78faf11ece6dc702656f"
-dependencies = [
- "memchr",
-]
-
-[[package]]
-name = "anchor-attribute-access-control"
-version = "0.24.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a9b75d05b6b4ac9d95bb6e3b786b27d3a708c4c5a87c92ffaa25bbe9ae4c5d91"
-dependencies = [
- "anchor-syn",
- "anyhow",
- "proc-macro2",
- "quote",
- "regex",
- "syn",
-]
-
-[[package]]
-name = "anchor-attribute-account"
-version = "0.24.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "485351a6d8157750d10d88c8e256f1bf8339262b2220ae9125aed3471309b5de"
-dependencies = [
- "anchor-syn",
- "anyhow",
- "bs58 0.4.0",
- "proc-macro2",
- "quote",
- "rustversion",
- "syn",
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diff --git a/lints/dup_mutable_accounts_2/Cargo.toml b/lints/dup_mutable_accounts_2/Cargo.toml
deleted file mode 100644
index 4811999..0000000
--- a/lints/dup_mutable_accounts_2/Cargo.toml
+++ /dev/null
@@ -1,33 +0,0 @@
-[package]
-name = "dup_mutable_accounts_2"
-version = "0.1.0"
-authors = ["authors go here"]
-description = "description goes here"
-edition = "2018"
-publish = false
-
-[lib]
-crate-type = ["cdylib"]
-
-[[example]]
-name = "insecure"
-path = "ui/insecure/src/lib.rs"
-
-[[example]]
-name = "secure"
-path = "ui/secure/src/lib.rs"
-
-[dependencies]
-clippy_utils = { git = "https://github.com/rust-lang/rust-clippy", rev = "0cb0f7636851f9fcc57085cf80197a2ef6db098f" }
-dylint_linting = "2.0.7"
-if_chain = "1.0.2"
-solana-lints = { path = "../../crate" }
-
-[dev-dependencies]
-anchor-lang = "0.24.2"
-dylint_testing = "2.0.7"
-
-[workspace]
-
-[package.metadata.rust-analyzer]
-rustc_private = true
diff --git a/lints/dup_mutable_accounts_2/README.md b/lints/dup_mutable_accounts_2/README.md
deleted file mode 100644
index f3079a7..0000000
--- a/lints/dup_mutable_accounts_2/README.md
+++ /dev/null
@@ -1,19 +0,0 @@
-# template
-
-**What it does:**
-
-**Why is this bad?**
-
-**Known problems:** None.
-
-**Example:**
-
-```rust
-// example code where a warning is issued
-```
-
-Use instead:
-
-```rust
-// example code that does not raise a warning
-```
diff --git a/lints/dup_mutable_accounts_2/rust-toolchain b/lints/dup_mutable_accounts_2/rust-toolchain
deleted file mode 100644
index 2056264..0000000
--- a/lints/dup_mutable_accounts_2/rust-toolchain
+++ /dev/null
@@ -1,3 +0,0 @@
-[toolchain]
-channel = "nightly-2022-06-30"
-components = ["llvm-tools-preview", "rustc-dev"]
diff --git a/lints/dup_mutable_accounts_2/src/lib.rs b/lints/dup_mutable_accounts_2/src/lib.rs
deleted file mode 100644
index df99235..0000000
--- a/lints/dup_mutable_accounts_2/src/lib.rs
+++ /dev/null
@@ -1,209 +0,0 @@
-#![feature(rustc_private)]
-#![warn(unused_extern_crates)]
-
-extern crate rustc_hir;
-extern crate rustc_middle;
-extern crate rustc_span;
-
-use clippy_utils::{
-    diagnostics::{span_lint_and_help, span_lint_and_note},
-    ty::match_type,
-    SpanlessEq,
-};
-use if_chain::if_chain;
-use rustc_hir::{
-    def_id::DefId,
-    intravisit::{walk_expr, FnKind, Visitor},
-    BinOpKind, Body, Expr, ExprKind, FnDecl, HirId, Mutability,
-};
-use rustc_lint::{LateContext, LateLintPass};
-use rustc_middle::ty::TyKind;
-use rustc_span::Span;
-use solana_lints::{paths, utils::visit_expr_no_bodies};
-
-use std::collections::HashMap;
-
-const ANCHOR_ACCOUNT_GENERIC_ARG_COUNT: usize = 2;
-
-dylint_linting::declare_late_lint! {
-    /// **What it does:**
-    ///
-    /// **Why is this bad?**
-    ///
-    /// **Known problems:** None.
-    ///
-    /// **Example:**
-    ///
-    /// ```rust
-    /// // example code where a warning is issued
-    /// ```
-    /// Use instead:
-    /// ```rust
-    /// // example code that does not raise a warning
-    /// ```
-    pub DUP_MUTABLE_ACCOUNTS_2,
-    Warn,
-    "description goes here"
-}
-
-impl<'tcx> LateLintPass<'tcx> for DupMutableAccounts2 {
-    fn check_fn(
-        &mut self,
-        cx: &LateContext<'tcx>,
-        _: FnKind<'tcx>,
-        _: &'tcx FnDecl<'tcx>,
-        body: &'tcx Body<'tcx>,
-        span: Span,
-        _: HirId,
-    ) {
-        if !span.from_expansion() {
-            // get all mutable references to Accounts and if_statements in body
-            let mut values = Values::new(cx);
-            values.get_referenced_accounts_and_if_statements(cx, body);
-            // println!("{:#?}", values.if_statements);
-
-            values.accounts.values().for_each(|exprs| {
-                if exprs.len() > 1 {
-                    for current in 0..exprs.len() - 1 {
-                        for next in current + 1..exprs.len() {
-                            if !values.check_key_constraint(exprs[current], exprs[next]) {
-                                span_lint_and_help(
-                                    cx,
-                                    DUP_MUTABLE_ACCOUNTS_2,
-                                    exprs[current].span,
-                                    "the following expressions have equivalent Account types, yet do not contain a proper key check.",
-                                    Some(exprs[next].span),
-                                    "add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()",
-                                );
-                            }
-                        }
-                    }
-                }
-            });
-        }
-    }
-}
-
-struct Values<'cx, 'tcx> {
-    cx: &'cx LateContext<'tcx>,
-    accounts: HashMap<DefId, Vec<&'tcx Expr<'tcx>>>,
-    if_statements: Vec<(&'tcx Expr<'tcx>, &'tcx Expr<'tcx>)>,
-}
-
-impl<'cx, 'tcx> Values<'cx, 'tcx> {
-    fn new(cx: &'cx LateContext<'tcx>) -> Self {
-        Values {
-            cx,
-            accounts: HashMap::new(),
-            if_statements: Vec::new(),
-        }
-    }
-
-    fn get_referenced_accounts_and_if_statements(
-        &mut self,
-        cx: &'cx LateContext<'tcx>,
-        body: &'tcx Body<'tcx>,
-    ) -> &Self {
-        self.visit_expr(&body.value);
-        self
-    }
-
-    /// Checks if there is a valid key constraint for `first_account` and `second_account`.
-    /// NOTE: currently only considers `first.key() == second.key()` or the symmetric relation as valid constraints.
-    /// TODO: if == relation used, should return some error in the THEN block
-    fn check_key_constraint(&self, first_account: &Expr<'_>, second_account: &Expr<'_>) -> bool {
-        for (left, right) in &self.if_statements {
-            if_chain! {
-                if let ExprKind::MethodCall(path_seg_left, exprs_left, _span) = left.kind;
-                if let ExprKind::MethodCall(path_seg_right, exprs_right, _span) = right.kind;
-                if path_seg_left.ident.name.as_str() == "key" && path_seg_right.ident.name.as_str() == "key";
-                if !exprs_left.is_empty() && !exprs_right.is_empty();
-                let mut spanless_eq = SpanlessEq::new(self.cx);
-                if (spanless_eq.eq_expr(&exprs_left[0], first_account) && spanless_eq.eq_expr(&exprs_right[0], second_account)) 
-                || (spanless_eq.eq_expr(&exprs_left[0], second_account) && spanless_eq.eq_expr(&exprs_right[0], first_account));
-                then {
-                    return true;
-                }
-            }
-        }
-        return false;
-    }
-}
-
-impl<'cx, 'tcx> Visitor<'tcx> for Values<'cx, 'tcx> {
-    fn visit_expr(&mut self, expr: &'tcx Expr<'tcx>) {
-        if_chain! {
-            // get mutable reference expressions
-            if let ExprKind::AddrOf(_, mutability, mut_expr) = expr.kind;
-            if let Mutability::Mut = mutability;
-            // check type of expr == Account<'info, T>
-            let middle_ty = self.cx.typeck_results().expr_ty(mut_expr);
-            if match_type(self.cx, middle_ty, &paths::ANCHOR_ACCOUNT);
-            // grab T generic parameter
-            if let TyKind::Adt(_adt_def, substs) = middle_ty.kind();
-            if substs.len() == ANCHOR_ACCOUNT_GENERIC_ARG_COUNT;
-            let account_type = substs[1].expect_ty(); // TODO: could just store middle::Ty instead of DefId?
-            if let Some(adt_def) = account_type.ty_adt_def();
-            then {
-                let def_id = adt_def.did();
-                if let Some(exprs) = self.accounts.get_mut(&def_id) {
-                    let mut spanless_eq = SpanlessEq::new(self.cx);
-                    // check that expr is not a duplicate within its particular key-pair
-                    if exprs.iter().all(|e| !spanless_eq.eq_expr(e, mut_expr)) {
-                        exprs.push(mut_expr);
-                    }
-                } else {
-                    self.accounts.insert(def_id, vec![mut_expr]);
-                }
-            }
-        }
-
-        // get if statements
-        if_chain! {
-            if let ExprKind::If(wrapped_if_expr, then, _else_opt) = expr.kind;
-            if let ExprKind::DropTemps(if_expr) = wrapped_if_expr.kind;
-            if let ExprKind::Binary(op, left, right) = if_expr.kind;
-            // TODO: leaves out || or &&. Could implement something that pulls apart
-            // an if expr that is of this form into individual == or != comparisons
-            if let BinOpKind::Ne | BinOpKind::Eq = op.node;
-            then {
-                // println!("{:#?}, {:#?}", expr, then);
-                self.if_statements.push((left, right));
-            }
-        }
-        walk_expr(self, expr);
-    }
-}
-
-// /// Performs a walk on `body`, checking whether there exists an expression that contains
-// /// a `key()` method call on `account_expr`.
-// fn contains_key_call<'tcx>(
-//     cx: &LateContext<'tcx>,
-//     body: &'tcx Body<'tcx>,
-//     account_expr: &Expr<'tcx>,
-// ) -> bool {
-//     visit_expr_no_bodies(&body.value, |expr| {
-//         if_chain! {
-//             if let ExprKind::MethodCall(path_seg, exprs, _span) = expr.kind;
-//             if path_seg.ident.name.as_str() == "key";
-//             if !exprs.is_empty();
-//             let mut spanless_eq = SpanlessEq::new(cx);
-//             if spanless_eq.eq_expr(&exprs[0], account_expr);
-//             then {
-//                 true
-//             } else {
-//                 false
-//             }
-//         }
-//     })
-// }
-
-#[test]
-fn insecure() {
-    dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "insecure");
-}
-
-#[test]
-fn secure() {
-    dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "secure");
-}
diff --git a/lints/dup_mutable_accounts_2/ui/insecure/Cargo.toml b/lints/dup_mutable_accounts_2/ui/insecure/Cargo.toml
deleted file mode 100644
index 6ab1b59..0000000
--- a/lints/dup_mutable_accounts_2/ui/insecure/Cargo.toml
+++ /dev/null
@@ -1,19 +0,0 @@
-[package]
-name = "duplicate-mutable-accounts-insecure"
-version = "0.1.0"
-description = "Created with Anchor"
-edition = "2018"
-
-[lib]
-crate-type = ["cdylib", "lib"]
-name = "duplicate_mutable_accounts_insecure"
-
-[features]
-no-entrypoint = []
-no-idl = []
-no-log-ix-name = []
-cpi = ["no-entrypoint"]
-default = []
-
-[dependencies]
-anchor-lang = "0.24.2"
diff --git a/lints/dup_mutable_accounts_2/ui/insecure/Xargo.toml b/lints/dup_mutable_accounts_2/ui/insecure/Xargo.toml
deleted file mode 100644
index 475fb71..0000000
--- a/lints/dup_mutable_accounts_2/ui/insecure/Xargo.toml
+++ /dev/null
@@ -1,2 +0,0 @@
-[target.bpfel-unknown-unknown.dependencies.std]
-features = []
diff --git a/lints/dup_mutable_accounts_2/ui/insecure/src/lib.rs b/lints/dup_mutable_accounts_2/ui/insecure/src/lib.rs
deleted file mode 100644
index 2e1d708..0000000
--- a/lints/dup_mutable_accounts_2/ui/insecure/src/lib.rs
+++ /dev/null
@@ -1,34 +0,0 @@
-use anchor_lang::prelude::*;
-
-declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
-
-#[program]
-pub mod duplicate_mutable_accounts_insecure {
-    use super::*;
-
-    pub fn update(
-        ctx: Context<Update>,
-        a: u64,
-        b: u64,
-    ) -> anchor_lang::solana_program::entrypoint::ProgramResult {
-        let user_a = &mut ctx.accounts.user_a;
-        let user_b = &mut ctx.accounts.user_b;
-
-        user_a.data = a;
-        user_b.data = b;
-        Ok(())
-    }
-}
-
-#[derive(Accounts)]
-pub struct Update<'info> {
-    user_a: Account<'info, User>,
-    user_b: Account<'info, User>,
-}
-
-#[account]
-pub struct User {
-    data: u64,
-}
-
-fn main() {}
diff --git a/lints/dup_mutable_accounts_2/ui/insecure/src/lib.stderr b/lints/dup_mutable_accounts_2/ui/insecure/src/lib.stderr
deleted file mode 100644
index 5a5c4ee..0000000
--- a/lints/dup_mutable_accounts_2/ui/insecure/src/lib.stderr
+++ /dev/null
@@ -1,27 +0,0 @@
-error: this expression does not have a key check but has the same account type as another expression
-  --> $DIR/lib.rs:14:27
-   |
-LL |         let user_a = &mut ctx.accounts.user_a;
-   |                           ^^^^^^^^^^^^^^^^^^^
-   |
-   = note: `-D dup-mutable-accounts-2` implied by `-D warnings`
-help: add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()
-  --> $DIR/lib.rs:15:27
-   |
-LL |         let user_b = &mut ctx.accounts.user_b;
-   |                           ^^^^^^^^^^^^^^^^^^^
-
-error: this expression does not have a key check but has the same account type as another expression
-  --> $DIR/lib.rs:15:27
-   |
-LL |         let user_b = &mut ctx.accounts.user_b;
-   |                           ^^^^^^^^^^^^^^^^^^^
-   |
-help: add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()
-  --> $DIR/lib.rs:14:27
-   |
-LL |         let user_a = &mut ctx.accounts.user_a;
-   |                           ^^^^^^^^^^^^^^^^^^^
-
-error: aborting due to 2 previous errors
-
diff --git a/lints/dup_mutable_accounts_2/ui/secure/Cargo.lock b/lints/dup_mutable_accounts_2/ui/secure/Cargo.lock
deleted file mode 100644
index 9090753..0000000
--- a/lints/dup_mutable_accounts_2/ui/secure/Cargo.lock
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diff --git a/lints/dup_mutable_accounts_2/ui/secure/Cargo.toml b/lints/dup_mutable_accounts_2/ui/secure/Cargo.toml
deleted file mode 100644
index 66812b2..0000000
--- a/lints/dup_mutable_accounts_2/ui/secure/Cargo.toml
+++ /dev/null
@@ -1,19 +0,0 @@
-[package]
-name = "duplicate-mutable-accounts-secure"
-version = "0.1.0"
-description = "Created with Anchor"
-edition = "2018"
-
-[lib]
-crate-type = ["cdylib", "lib"]
-name = "duplicate_mutable_accounts_secure"
-
-[features]
-no-entrypoint = []
-no-idl = []
-no-log-ix-name = []
-cpi = ["no-entrypoint"]
-default = []
-
-[dependencies]
-anchor-lang = "0.24.2"
diff --git a/lints/dup_mutable_accounts_2/ui/secure/Xargo.toml b/lints/dup_mutable_accounts_2/ui/secure/Xargo.toml
deleted file mode 100644
index 475fb71..0000000
--- a/lints/dup_mutable_accounts_2/ui/secure/Xargo.toml
+++ /dev/null
@@ -1,2 +0,0 @@
-[target.bpfel-unknown-unknown.dependencies.std]
-features = []
diff --git a/lints/dup_mutable_accounts_2/ui/secure/src/lib.rs b/lints/dup_mutable_accounts_2/ui/secure/src/lib.rs
deleted file mode 100644
index 0f62931..0000000
--- a/lints/dup_mutable_accounts_2/ui/secure/src/lib.rs
+++ /dev/null
@@ -1,42 +0,0 @@
-use anchor_lang::prelude::*;
-
-declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
-
-#[program]
-pub mod duplicate_mutable_accounts_secure {
-    use super::*;
-
-    pub fn update(
-        ctx: Context<Update>,
-        a: u64,
-        b: u64,
-    ) -> anchor_lang::solana_program::entrypoint::ProgramResult {
-        if ctx.accounts.user_a.key() == ctx.accounts.user_b.key() {
-            return Err(ProgramError::InvalidArgument);
-        }
-
-        // if ctx.accounts.user_a.key() != ctx.accounts.user_b.key() {
-        //     // do program stuff
-        // }
-
-        let user_a = &mut ctx.accounts.user_a;
-        let user_b = &mut ctx.accounts.user_b;
-
-        user_a.data = a;
-        user_b.data = b;
-        Ok(())
-    }
-}
-
-#[derive(Accounts)]
-pub struct Update<'info> {
-    user_a: Account<'info, User>,
-    user_b: Account<'info, User>,
-}
-
-#[account]
-pub struct User {
-    data: u64,
-}
-
-fn main() {}
diff --git a/lints/duplicate-mutable-accounts/src/lib.rs b/lints/duplicate-mutable-accounts/src/lib.rs
index 60c16b1..42eab8a 100644
--- a/lints/duplicate-mutable-accounts/src/lib.rs
+++ b/lints/duplicate-mutable-accounts/src/lib.rs
@@ -29,7 +29,7 @@ const ANCHOR_ACCOUNT_GENERIC_ARG_COUNT: usize = 2;
 dylint_linting::impl_late_lint! {
     /// **What it does:** Checks to make sure there is a key check on identical Anchor accounts.
     /// The key check serves to make sure that two identical accounts do not have the same key,
-    /// ie, they are unique. An Anchor account (`Account<'info, T>`) is identical to another if 
+    /// ie, they are unique. An Anchor account (`Account<'info, T>`) is identical to another if
     /// the generic parameter `T` is the same type for each account.
     ///
     /// **Why is this bad?** If a program contains two identical, mutable Anchor accounts, and
@@ -46,12 +46,12 @@ dylint_linting::impl_late_lint! {
     /// lint regards expressions with `==` as a secure check, since it assumes the program will
     /// then return an error (see the secure example). However, it does not explicitly check that
     /// an error is returned.
-    /// 
+    ///
     /// In general, this lint will catch all vulnerabilities if the anchor macro constraints are
     /// used (see the recommended example). It is not as robust if alternative methods are utilized.
     /// Thus it is encouraged to use the anchor `#[account]` macro constraints.
     ///
-    /// **Example:** 
+    /// **Example:**
     ///
     /// ```rust
     /// #[derive(Accounts)]

From d1fe4c58a61a37b5386b2e7fbb4f43efb4e743a6 Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Tue, 19 Jul 2022 14:33:52 -0500
Subject: [PATCH 16/24] make ci happy

---
 lints/duplicate-mutable-accounts/README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lints/duplicate-mutable-accounts/README.md b/lints/duplicate-mutable-accounts/README.md
index 7f9e941..2acf315 100644
--- a/lints/duplicate-mutable-accounts/README.md
+++ b/lints/duplicate-mutable-accounts/README.md
@@ -2,7 +2,7 @@
 
 **What it does:** Checks to make sure there is a key check on identical Anchor accounts.
 The key check serves to make sure that two identical accounts do not have the same key,
-ie, they are unique. An Anchor account (`Account<'info, T>`) is identical to another if 
+ie, they are unique. An Anchor account (`Account<'info, T>`) is identical to another if
 the generic parameter `T` is the same type for each account.
 
 **Why is this bad?** If a program contains two identical, mutable Anchor accounts, and

From 3e8785e965da25bacaf4fcb31267e078bd44c2c2 Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Tue, 19 Jul 2022 14:54:05 -0500
Subject: [PATCH 17/24] fix clippy errors

---
 .../src/anchor_constraint.rs                  |  2 +-
 lints/duplicate-mutable-accounts/src/lib.rs   | 36 ++++++++++---------
 2 files changed, 20 insertions(+), 18 deletions(-)

diff --git a/lints/duplicate-mutable-accounts/src/anchor_constraint.rs b/lints/duplicate-mutable-accounts/src/anchor_constraint.rs
index a6fad9c..10d3a37 100644
--- a/lints/duplicate-mutable-accounts/src/anchor_constraint.rs
+++ b/lints/duplicate-mutable-accounts/src/anchor_constraint.rs
@@ -83,7 +83,7 @@ fn create_token_from_ident(s: &str) -> TokenTree {
 pub struct Streams(pub Vec<TokenStream>);
 
 impl Streams {
-    /// Returns true if `self` has a TokenStream that `other` is a substream of
+    /// Returns true if `self` has a `TokenStream` that `other` is a substream of
     pub fn contains(&self, other: &TokenStream) -> bool {
         self.0
             .iter()
diff --git a/lints/duplicate-mutable-accounts/src/lib.rs b/lints/duplicate-mutable-accounts/src/lib.rs
index 42eab8a..aa9ab52 100644
--- a/lints/duplicate-mutable-accounts/src/lib.rs
+++ b/lints/duplicate-mutable-accounts/src/lib.rs
@@ -9,8 +9,10 @@ extern crate rustc_span;
 mod alternate_constraint;
 mod anchor_constraint;
 
-use crate::alternate_constraint::*;
-use crate::anchor_constraint::*;
+use crate::alternate_constraint::Values;
+use crate::anchor_constraint::{
+    create_key_check_constraint_tokenstream, get_anchor_account_type_def_id, get_def_id, Streams,
+};
 
 use std::collections::{HashMap, VecDeque};
 use std::default::Default;
@@ -148,10 +150,23 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
 
     fn check_crate_post(&mut self, cx: &LateContext<'tcx>) {
         // if collected some anchor macro constraints then perform v1 lint
-        if !self.streams.0.is_empty() {
+        if self.streams.0.is_empty() {
+            // TODO: Not a fan of having it span lints for this check when there are no checks whatsoever.
+            // I'd rather have it span lints to recommended anchor macros, if no checks are found at all
+            for (first, second) in &self.spans {
+                span_lint_and_help(
+                    cx,
+                    DUPLICATE_MUTABLE_ACCOUNTS,
+                    *first,
+                    &format!("the expressions on line {:?} and {:?} have identical Account types, yet do not contain a proper key check.", first, second),
+                    Some(*second),
+                    "add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()",
+                );
+            }
+        } else {
             for v in self.accounts.values() {
                 if v.len() > 1 {
-                    let mut deq = VecDeque::from(v.to_owned());
+                    let mut deq = VecDeque::from(v.clone());
                     for _ in 0..deq.len() - 1 {
                         let (first, first_span) = deq.pop_front().unwrap();
                         for (other, other_span) in &deq {
@@ -175,19 +190,6 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
                     }
                 }
             }
-        } else {
-            // TODO: Not a fan of having it span lints for this check when there are no checks whatsoever.
-            // I'd rather have it span lints to recommended anchor macros, if no checks are found at all
-            for (first, second) in &self.spans {
-                span_lint_and_help(
-                    cx,
-                    DUPLICATE_MUTABLE_ACCOUNTS,
-                    *first,
-                    &format!("the expressions on line {:?} and {:?} have identical Account types, yet do not contain a proper key check.", first, second),
-                    Some(*second),
-                    "add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()",
-                );
-            }
         }
     }
 }

From dc3d01df3b53b3106930ec8f023b3b249923bfb0 Mon Sep 17 00:00:00 2001
From: Samuel Moelius <samuel.moelius@trailofbits.com>
Date: Thu, 21 Jul 2022 02:01:53 +0000
Subject: [PATCH 18/24] Remove .gitignore file; add Cargo.lock

---
 lints/duplicate-mutable-accounts/.gitignore |    2 -
 lints/duplicate-mutable-accounts/Cargo.lock | 1799 +++++++++++++++++++
 2 files changed, 1799 insertions(+), 2 deletions(-)
 delete mode 100644 lints/duplicate-mutable-accounts/.gitignore
 create mode 100644 lints/duplicate-mutable-accounts/Cargo.lock

diff --git a/lints/duplicate-mutable-accounts/.gitignore b/lints/duplicate-mutable-accounts/.gitignore
deleted file mode 100644
index 4fffb2f..0000000
--- a/lints/duplicate-mutable-accounts/.gitignore
+++ /dev/null
@@ -1,2 +0,0 @@
-/target
-/Cargo.lock
diff --git a/lints/duplicate-mutable-accounts/Cargo.lock b/lints/duplicate-mutable-accounts/Cargo.lock
new file mode 100644
index 0000000..739d821
--- /dev/null
+++ b/lints/duplicate-mutable-accounts/Cargo.lock
@@ -0,0 +1,1799 @@
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From 5ac4c860d0324a8d6d6860ab1103f9f5aca1f95c Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Thu, 21 Jul 2022 15:09:41 -0500
Subject: [PATCH 19/24] fix lint messages when no constraints at all to
 recommend anchor constraints

---
 .../src/alternate_constraint.rs               |  4 +-
 lints/duplicate-mutable-accounts/src/lib.rs   | 81 ++++++++++++-------
 .../ui/insecure-2/src/lib.stderr              | 48 +++++------
 .../ui/insecure/src/lib.stderr                | 16 ++--
 4 files changed, 89 insertions(+), 60 deletions(-)

diff --git a/lints/duplicate-mutable-accounts/src/alternate_constraint.rs b/lints/duplicate-mutable-accounts/src/alternate_constraint.rs
index 4771fd9..4cb38de 100644
--- a/lints/duplicate-mutable-accounts/src/alternate_constraint.rs
+++ b/lints/duplicate-mutable-accounts/src/alternate_constraint.rs
@@ -13,9 +13,12 @@ use clippy_utils::{ty::match_type, SpanlessEq};
 use if_chain::if_chain;
 use solana_lints::paths;
 
+/// Stores the accounts and if-statements (constraints) found in a function body.
 pub struct Values<'cx, 'tcx> {
     cx: &'cx LateContext<'tcx>,
+    /// Lists of account expressions, partitioned by the Account type T
     pub accounts: HashMap<DefId, Vec<&'tcx Expr<'tcx>>>,
+    /// List of tuples, where (x, y), where x is the left operand of the if statement and y is the right
     pub if_statements: Vec<(&'tcx Expr<'tcx>, &'tcx Expr<'tcx>)>,
 }
 
@@ -34,7 +37,6 @@ impl<'cx, 'tcx> Values<'cx, 'tcx> {
     }
 
     /// Checks if there is a valid key constraint for `first_account` and `second_account`.
-    /// NOTE: currently only considers `first.key() == second.key()` or the symmetric relation as valid constraints.
     /// TODO: if == relation used, should return some error in the THEN block
     pub fn check_key_constraint(
         &self,
diff --git a/lints/duplicate-mutable-accounts/src/lib.rs b/lints/duplicate-mutable-accounts/src/lib.rs
index aa9ab52..88e444b 100644
--- a/lints/duplicate-mutable-accounts/src/lib.rs
+++ b/lints/duplicate-mutable-accounts/src/lib.rs
@@ -79,9 +79,14 @@ dylint_linting::impl_late_lint! {
 
 #[derive(Default, Debug)]
 struct DuplicateMutableAccounts {
-    accounts: HashMap<DefId, Vec<(Symbol, Span)>>,
-    streams: Streams,
+    /// Lists of Anchor accounts found in structs that derive Anchor `Accounts` trait, partitioned by Anchor account type
+    anchor_accounts: HashMap<DefId, Vec<(Symbol, Span)>>,
+    /// List of Anchor `#[account]` macro  constraints
+    anchor_macro_constraints: Streams,
+    /// List of pairs of Anchor accounts with same types, without any alternate constraint
     spans: Vec<(Span, Span)>,
+    /// Indicates if alternate constraints were used or not
+    no_alternate_constraints: bool,
 }
 
 impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
@@ -94,10 +99,10 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
                     if match_type(cx, middle_ty, &paths::ANCHOR_ACCOUNT);
                     if let Some(account_id) = get_anchor_account_type_def_id(field);
                     then {
-                        if let Some(v) = self.accounts.get_mut(&account_id) {
+                        if let Some(v) = self.anchor_accounts.get_mut(&account_id) {
                             v.push((field.ident.name, field.span));
                         } else {
-                            self.accounts.insert(account_id, vec![(field.ident.name, field.span)]);
+                            self.anchor_accounts.insert(account_id, vec![(field.ident.name, field.span)]);
                         }
                     }
                 }
@@ -112,7 +117,7 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
             if name.as_str() == "account";
             if let MacArgs::Delimited(_, _, token_stream) = &attr_item.args;
             then {
-                self.streams.0.push(token_stream.clone());
+                self.anchor_macro_constraints.0.push(token_stream.clone());
             }
         }
     }
@@ -127,19 +132,19 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
         _: HirId,
     ) {
         if !span.from_expansion() {
-            // get all mutable references to Accounts and if_statements in body
             let mut values = Values::new(cx);
             values.get_referenced_accounts_and_if_statements(body);
 
-            // NOTE: could do this check in check_post_crate if exprs are replaced with HirId, then use
-            // the HirId to fetch the expr
             values.accounts.values().for_each(|exprs| {
                 if exprs.len() > 1 {
+                    self.no_alternate_constraints = true; // assume no alternate constraints
                     for current in 0..exprs.len() - 1 {
                         for next in current + 1..exprs.len() {
                             if !values.check_key_constraint(exprs[current], exprs[next]) {
-                                // store for later spanning
                                 self.spans.push((exprs[current].span, exprs[next].span));
+                            } else {
+                                // if there is at least one alt constraint, set flag to false
+                                self.no_alternate_constraints = false;
                             }
                         }
                     }
@@ -149,24 +154,46 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
     }
 
     fn check_crate_post(&mut self, cx: &LateContext<'tcx>) {
-        // if collected some anchor macro constraints then perform v1 lint
-        if self.streams.0.is_empty() {
-            // TODO: Not a fan of having it span lints for this check when there are no checks whatsoever.
-            // I'd rather have it span lints to recommended anchor macros, if no checks are found at all
-            for (first, second) in &self.spans {
-                span_lint_and_help(
-                    cx,
-                    DUPLICATE_MUTABLE_ACCOUNTS,
-                    *first,
-                    &format!("the expressions on line {:?} and {:?} have identical Account types, yet do not contain a proper key check.", first, second),
-                    Some(*second),
-                    "add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()",
-                );
+        // if no anchor constraints, check for alternate constraints
+        if self.anchor_macro_constraints.0.is_empty() {
+            // if no alternate constraints either, recommend using anchor constraints
+            if self.no_alternate_constraints {
+                for ident_accounts in self.anchor_accounts.values() {
+                    if ident_accounts.len() > 1 {
+                        for current in 0..ident_accounts.len() - 1 {
+                            for next in current + 1..ident_accounts.len() {
+                                let first = ident_accounts[current];
+                                let second = ident_accounts[next];
+                                span_lint_and_help(
+                                    cx,
+                                    DUPLICATE_MUTABLE_ACCOUNTS,
+                                    first.1,
+                                    &format!("{} and {} have identical account types but do not have a key check constraint", first.0, second.0),
+                                    Some(second.1),
+                                    &format!("add an anchor key check constraint: #[account(constraint = {}.key() != {}.key())]", first.0, second.0)
+                                );
+                            }
+                        }
+                    }
+                }
+            } else {
+                // flag lint for missing alternate constraints
+                for (first, second) in &self.spans {
+                    span_lint_and_help(
+                        cx,
+                        DUPLICATE_MUTABLE_ACCOUNTS,
+                        *first,
+                        &format!("the expressions on line {:?} and {:?} have identical Account types, yet do not contain a proper key check.", first, second),
+                        Some(*second),
+                        "add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()",
+                    );
+                }
             }
         } else {
-            for v in self.accounts.values() {
-                if v.len() > 1 {
-                    let mut deq = VecDeque::from(v.clone());
+            // if using anchor constraints, check and flag for missing anchor constraints
+            for ident_accounts in self.anchor_accounts.values() {
+                if ident_accounts.len() > 1 {
+                    let mut deq = VecDeque::from(ident_accounts.clone());
                     for _ in 0..deq.len() - 1 {
                         let (first, first_span) = deq.pop_front().unwrap();
                         for (other, other_span) in &deq {
@@ -174,8 +201,8 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
                             let symmetric_stream =
                                 create_key_check_constraint_tokenstream(*other, first);
 
-                            if !(self.streams.contains(&stream)
-                                || self.streams.contains(&symmetric_stream))
+                            if !(self.anchor_macro_constraints.contains(&stream)
+                                || self.anchor_macro_constraints.contains(&symmetric_stream))
                             {
                                 span_lint_and_help(
                                     cx,
diff --git a/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.stderr b/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.stderr
index 06a1eca..2dcf128 100644
--- a/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.stderr
+++ b/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.stderr
@@ -1,39 +1,39 @@
-error: the expressions on line $DIR/lib.rs:15:27: 15:46 (#0) and $DIR/lib.rs:16:27: 16:46 (#0) have identical Account types, yet do not contain a proper key check.
-  --> $DIR/lib.rs:15:27
+error: user_a and user_b have identical account types but do not have a key check constraint
+  --> $DIR/lib.rs:28:5
    |
-LL |         let user_a = &mut ctx.accounts.user_a;
-   |                           ^^^^^^^^^^^^^^^^^^^
+LL |     user_a: Account<'info, User>,
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `-D duplicate-mutable-accounts` implied by `-D warnings`
-help: add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()
-  --> $DIR/lib.rs:16:27
+help: add an anchor key check constraint: #[account(constraint = user_a.key() != user_b.key())]
+  --> $DIR/lib.rs:29:5
    |
-LL |         let user_b = &mut ctx.accounts.user_b;
-   |                           ^^^^^^^^^^^^^^^^^^^
+LL |     user_b: Account<'info, User>,
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: the expressions on line $DIR/lib.rs:15:27: 15:46 (#0) and $DIR/lib.rs:17:27: 17:46 (#0) have identical Account types, yet do not contain a proper key check.
-  --> $DIR/lib.rs:15:27
+error: user_a and user_c have identical account types but do not have a key check constraint
+  --> $DIR/lib.rs:28:5
    |
-LL |         let user_a = &mut ctx.accounts.user_a;
-   |                           ^^^^^^^^^^^^^^^^^^^
+LL |     user_a: Account<'info, User>,
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-help: add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()
-  --> $DIR/lib.rs:17:27
+help: add an anchor key check constraint: #[account(constraint = user_a.key() != user_c.key())]
+  --> $DIR/lib.rs:30:5
    |
-LL |         let user_c = &mut ctx.accounts.user_c;
-   |                           ^^^^^^^^^^^^^^^^^^^
+LL |     user_c: Account<'info, User>,
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: the expressions on line $DIR/lib.rs:16:27: 16:46 (#0) and $DIR/lib.rs:17:27: 17:46 (#0) have identical Account types, yet do not contain a proper key check.
-  --> $DIR/lib.rs:16:27
+error: user_b and user_c have identical account types but do not have a key check constraint
+  --> $DIR/lib.rs:29:5
    |
-LL |         let user_b = &mut ctx.accounts.user_b;
-   |                           ^^^^^^^^^^^^^^^^^^^
+LL |     user_b: Account<'info, User>,
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-help: add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()
-  --> $DIR/lib.rs:17:27
+help: add an anchor key check constraint: #[account(constraint = user_b.key() != user_c.key())]
+  --> $DIR/lib.rs:30:5
    |
-LL |         let user_c = &mut ctx.accounts.user_c;
-   |                           ^^^^^^^^^^^^^^^^^^^
+LL |     user_c: Account<'info, User>,
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: aborting due to 3 previous errors
 
diff --git a/lints/duplicate-mutable-accounts/ui/insecure/src/lib.stderr b/lints/duplicate-mutable-accounts/ui/insecure/src/lib.stderr
index d86ec52..064418c 100644
--- a/lints/duplicate-mutable-accounts/ui/insecure/src/lib.stderr
+++ b/lints/duplicate-mutable-accounts/ui/insecure/src/lib.stderr
@@ -1,15 +1,15 @@
-error: the expressions on line $DIR/lib.rs:14:27: 14:46 (#0) and $DIR/lib.rs:15:27: 15:46 (#0) have identical Account types, yet do not contain a proper key check.
-  --> $DIR/lib.rs:14:27
+error: user_a and user_b have identical account types but do not have a key check constraint
+  --> $DIR/lib.rs:25:5
    |
-LL |         let user_a = &mut ctx.accounts.user_a;
-   |                           ^^^^^^^^^^^^^^^^^^^
+LL |     user_a: Account<'info, User>,
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `-D duplicate-mutable-accounts` implied by `-D warnings`
-help: add a key check to make sure the accounts have different keys, e.g., x.key() != y.key()
-  --> $DIR/lib.rs:15:27
+help: add an anchor key check constraint: #[account(constraint = user_a.key() != user_b.key())]
+  --> $DIR/lib.rs:26:5
    |
-LL |         let user_b = &mut ctx.accounts.user_b;
-   |                           ^^^^^^^^^^^^^^^^^^^
+LL |     user_b: Account<'info, User>,
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: aborting due to previous error
 

From 1371f3f976ecc568b168596343a439376f07887d Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Fri, 22 Jul 2022 09:36:38 -0500
Subject: [PATCH 20/24] clean up is_substream logic

---
 .../src/alternate_constraint.rs               |  9 ++++---
 .../src/anchor_constraint.rs                  | 26 +++++++------------
 lints/duplicate-mutable-accounts/src/lib.rs   |  9 ++++---
 3 files changed, 21 insertions(+), 23 deletions(-)

diff --git a/lints/duplicate-mutable-accounts/src/alternate_constraint.rs b/lints/duplicate-mutable-accounts/src/alternate_constraint.rs
index 4cb38de..230d1f9 100644
--- a/lints/duplicate-mutable-accounts/src/alternate_constraint.rs
+++ b/lints/duplicate-mutable-accounts/src/alternate_constraint.rs
@@ -47,11 +47,14 @@ impl<'cx, 'tcx> Values<'cx, 'tcx> {
             if_chain! {
                 if let ExprKind::MethodCall(path_seg_left, exprs_left, _span) = left.kind;
                 if let ExprKind::MethodCall(path_seg_right, exprs_right, _span) = right.kind;
-                if path_seg_left.ident.name.as_str() == "key" && path_seg_right.ident.name.as_str() == "key";
+                if path_seg_left.ident.name.as_str() == "key"
+                    && path_seg_right.ident.name.as_str() == "key";
                 if !exprs_left.is_empty() && !exprs_right.is_empty();
                 let mut spanless_eq = SpanlessEq::new(self.cx);
-                if (spanless_eq.eq_expr(&exprs_left[0], first_account) && spanless_eq.eq_expr(&exprs_right[0], second_account))
-                || (spanless_eq.eq_expr(&exprs_left[0], second_account) && spanless_eq.eq_expr(&exprs_right[0], first_account));
+                if (spanless_eq.eq_expr(&exprs_left[0], first_account)
+                    && spanless_eq.eq_expr(&exprs_right[0], second_account))
+                    || (spanless_eq.eq_expr(&exprs_left[0], second_account)
+                        && spanless_eq.eq_expr(&exprs_right[0], first_account));
                 then {
                     return true;
                 }
diff --git a/lints/duplicate-mutable-accounts/src/anchor_constraint.rs b/lints/duplicate-mutable-accounts/src/anchor_constraint.rs
index 10d3a37..dada579 100644
--- a/lints/duplicate-mutable-accounts/src/anchor_constraint.rs
+++ b/lints/duplicate-mutable-accounts/src/anchor_constraint.rs
@@ -90,27 +90,21 @@ impl Streams {
             .any(|token_stream| Self::is_substream(token_stream, other))
     }
 
-    /// Returns true if `other` is a substream of `stream`. By substream we mean in the
-    /// sense of a substring.
+    /// Returns true if `other` is a substream of `stream`. By substream we mean in the sense of a substring.
     // NOTE: a possible optimization is when a match is found, to remove the matched
     // TokenTrees from the TokenStream, since the constraint has been "checked" so it never
     // needs to be validated again. This cuts down the number of comparisons.
     fn is_substream(stream: &TokenStream, other: &TokenStream) -> bool {
-        let other_len = other.len();
         for i in 0..stream.len() {
-            for (j, other_token) in other.trees().enumerate() {
-                match stream.trees().nth(i + j) {
-                    Some(token_tree) => {
-                        if !token_tree.eq_unspanned(other_token) {
-                            break;
-                        }
-                        // reached last index, so we have a match
-                        if j == other_len - 1 {
-                            return true;
-                        }
-                    }
-                    None => return false, // reached end of stream
-                }
+            if other
+                .trees()
+                .enumerate()
+                .all(|(j, other_token)| match stream.trees().nth(i + j) {
+                    Some(token_tree) => token_tree.eq_unspanned(other_token),
+                    None => false,
+                })
+            {
+                return true;
             }
         }
         false
diff --git a/lints/duplicate-mutable-accounts/src/lib.rs b/lints/duplicate-mutable-accounts/src/lib.rs
index 88e444b..2ce4a02 100644
--- a/lints/duplicate-mutable-accounts/src/lib.rs
+++ b/lints/duplicate-mutable-accounts/src/lib.rs
@@ -102,7 +102,8 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
                         if let Some(v) = self.anchor_accounts.get_mut(&account_id) {
                             v.push((field.ident.name, field.span));
                         } else {
-                            self.anchor_accounts.insert(account_id, vec![(field.ident.name, field.span)]);
+                            self.anchor_accounts
+                                .insert(account_id, vec![(field.ident.name, field.span)]);
                         }
                     }
                 }
@@ -140,11 +141,11 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
                     self.no_alternate_constraints = true; // assume no alternate constraints
                     for current in 0..exprs.len() - 1 {
                         for next in current + 1..exprs.len() {
-                            if !values.check_key_constraint(exprs[current], exprs[next]) {
-                                self.spans.push((exprs[current].span, exprs[next].span));
-                            } else {
+                            if values.check_key_constraint(exprs[current], exprs[next]) {
                                 // if there is at least one alt constraint, set flag to false
                                 self.no_alternate_constraints = false;
+                            } else {
+                                self.spans.push((exprs[current].span, exprs[next].span));
                             }
                         }
                     }

From f2aa39ed7e033416bced55bcab7828a6e75acc69 Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Tue, 26 Jul 2022 10:52:30 -0500
Subject: [PATCH 21/24] rename lint 6

---
 .../.cargo/config.toml                                            | 0
 .../Cargo.lock                                                    | 0
 .../Cargo.toml                                                    | 0
 .../README.md                                                     | 0
 .../rust-toolchain                                                | 0
 .../src/alternate_constraint.rs                                   | 0
 .../src/anchor_constraint.rs                                      | 0
 .../src/lib.rs                                                    | 0
 .../ui/insecure-2/Cargo.toml                                      | 0
 .../ui/insecure-2/Xargo.toml                                      | 0
 .../ui/insecure-2/src/lib.rs                                      | 0
 .../ui/insecure-2/src/lib.stderr                                  | 0
 .../ui/insecure/Cargo.toml                                        | 0
 .../ui/insecure/Xargo.toml                                        | 0
 .../ui/insecure/src/lib.rs                                        | 0
 .../ui/insecure/src/lib.stderr                                    | 0
 .../ui/recommended-2/Cargo.toml                                   | 0
 .../ui/recommended-2/Xargo.toml                                   | 0
 .../ui/recommended-2/src/lib.rs                                   | 0
 .../ui/recommended-2/src/lib.stderr                               | 0
 .../ui/recommended/Cargo.toml                                     | 0
 .../ui/recommended/Xargo.toml                                     | 0
 .../ui/recommended/src/lib.rs                                     | 0
 .../ui/recommended/src/lib.stderr                                 | 0
 .../ui/secure/Cargo.toml                                          | 0
 .../ui/secure/Xargo.toml                                          | 0
 .../ui/secure/src/lib.rs                                          | 0
 .../ui/secure/src/lib.stderr                                      | 0
 28 files changed, 0 insertions(+), 0 deletions(-)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/.cargo/config.toml (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/Cargo.lock (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/Cargo.toml (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/README.md (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/rust-toolchain (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/src/alternate_constraint.rs (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/src/anchor_constraint.rs (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/src/lib.rs (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/ui/insecure-2/Cargo.toml (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/ui/insecure-2/Xargo.toml (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/ui/insecure-2/src/lib.rs (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/ui/insecure-2/src/lib.stderr (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/ui/insecure/Cargo.toml (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/ui/insecure/Xargo.toml (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/ui/insecure/src/lib.rs (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/ui/insecure/src/lib.stderr (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/ui/recommended-2/Cargo.toml (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/ui/recommended-2/Xargo.toml (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/ui/recommended-2/src/lib.rs (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/ui/recommended-2/src/lib.stderr (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/ui/recommended/Cargo.toml (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/ui/recommended/Xargo.toml (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/ui/recommended/src/lib.rs (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/ui/recommended/src/lib.stderr (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/ui/secure/Cargo.toml (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/ui/secure/Xargo.toml (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/ui/secure/src/lib.rs (100%)
 rename lints/{duplicate-mutable-accounts => duplicate_mutable_accounts}/ui/secure/src/lib.stderr (100%)

diff --git a/lints/duplicate-mutable-accounts/.cargo/config.toml b/lints/duplicate_mutable_accounts/.cargo/config.toml
similarity index 100%
rename from lints/duplicate-mutable-accounts/.cargo/config.toml
rename to lints/duplicate_mutable_accounts/.cargo/config.toml
diff --git a/lints/duplicate-mutable-accounts/Cargo.lock b/lints/duplicate_mutable_accounts/Cargo.lock
similarity index 100%
rename from lints/duplicate-mutable-accounts/Cargo.lock
rename to lints/duplicate_mutable_accounts/Cargo.lock
diff --git a/lints/duplicate-mutable-accounts/Cargo.toml b/lints/duplicate_mutable_accounts/Cargo.toml
similarity index 100%
rename from lints/duplicate-mutable-accounts/Cargo.toml
rename to lints/duplicate_mutable_accounts/Cargo.toml
diff --git a/lints/duplicate-mutable-accounts/README.md b/lints/duplicate_mutable_accounts/README.md
similarity index 100%
rename from lints/duplicate-mutable-accounts/README.md
rename to lints/duplicate_mutable_accounts/README.md
diff --git a/lints/duplicate-mutable-accounts/rust-toolchain b/lints/duplicate_mutable_accounts/rust-toolchain
similarity index 100%
rename from lints/duplicate-mutable-accounts/rust-toolchain
rename to lints/duplicate_mutable_accounts/rust-toolchain
diff --git a/lints/duplicate-mutable-accounts/src/alternate_constraint.rs b/lints/duplicate_mutable_accounts/src/alternate_constraint.rs
similarity index 100%
rename from lints/duplicate-mutable-accounts/src/alternate_constraint.rs
rename to lints/duplicate_mutable_accounts/src/alternate_constraint.rs
diff --git a/lints/duplicate-mutable-accounts/src/anchor_constraint.rs b/lints/duplicate_mutable_accounts/src/anchor_constraint.rs
similarity index 100%
rename from lints/duplicate-mutable-accounts/src/anchor_constraint.rs
rename to lints/duplicate_mutable_accounts/src/anchor_constraint.rs
diff --git a/lints/duplicate-mutable-accounts/src/lib.rs b/lints/duplicate_mutable_accounts/src/lib.rs
similarity index 100%
rename from lints/duplicate-mutable-accounts/src/lib.rs
rename to lints/duplicate_mutable_accounts/src/lib.rs
diff --git a/lints/duplicate-mutable-accounts/ui/insecure-2/Cargo.toml b/lints/duplicate_mutable_accounts/ui/insecure-2/Cargo.toml
similarity index 100%
rename from lints/duplicate-mutable-accounts/ui/insecure-2/Cargo.toml
rename to lints/duplicate_mutable_accounts/ui/insecure-2/Cargo.toml
diff --git a/lints/duplicate-mutable-accounts/ui/insecure-2/Xargo.toml b/lints/duplicate_mutable_accounts/ui/insecure-2/Xargo.toml
similarity index 100%
rename from lints/duplicate-mutable-accounts/ui/insecure-2/Xargo.toml
rename to lints/duplicate_mutable_accounts/ui/insecure-2/Xargo.toml
diff --git a/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.rs b/lints/duplicate_mutable_accounts/ui/insecure-2/src/lib.rs
similarity index 100%
rename from lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.rs
rename to lints/duplicate_mutable_accounts/ui/insecure-2/src/lib.rs
diff --git a/lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.stderr b/lints/duplicate_mutable_accounts/ui/insecure-2/src/lib.stderr
similarity index 100%
rename from lints/duplicate-mutable-accounts/ui/insecure-2/src/lib.stderr
rename to lints/duplicate_mutable_accounts/ui/insecure-2/src/lib.stderr
diff --git a/lints/duplicate-mutable-accounts/ui/insecure/Cargo.toml b/lints/duplicate_mutable_accounts/ui/insecure/Cargo.toml
similarity index 100%
rename from lints/duplicate-mutable-accounts/ui/insecure/Cargo.toml
rename to lints/duplicate_mutable_accounts/ui/insecure/Cargo.toml
diff --git a/lints/duplicate-mutable-accounts/ui/insecure/Xargo.toml b/lints/duplicate_mutable_accounts/ui/insecure/Xargo.toml
similarity index 100%
rename from lints/duplicate-mutable-accounts/ui/insecure/Xargo.toml
rename to lints/duplicate_mutable_accounts/ui/insecure/Xargo.toml
diff --git a/lints/duplicate-mutable-accounts/ui/insecure/src/lib.rs b/lints/duplicate_mutable_accounts/ui/insecure/src/lib.rs
similarity index 100%
rename from lints/duplicate-mutable-accounts/ui/insecure/src/lib.rs
rename to lints/duplicate_mutable_accounts/ui/insecure/src/lib.rs
diff --git a/lints/duplicate-mutable-accounts/ui/insecure/src/lib.stderr b/lints/duplicate_mutable_accounts/ui/insecure/src/lib.stderr
similarity index 100%
rename from lints/duplicate-mutable-accounts/ui/insecure/src/lib.stderr
rename to lints/duplicate_mutable_accounts/ui/insecure/src/lib.stderr
diff --git a/lints/duplicate-mutable-accounts/ui/recommended-2/Cargo.toml b/lints/duplicate_mutable_accounts/ui/recommended-2/Cargo.toml
similarity index 100%
rename from lints/duplicate-mutable-accounts/ui/recommended-2/Cargo.toml
rename to lints/duplicate_mutable_accounts/ui/recommended-2/Cargo.toml
diff --git a/lints/duplicate-mutable-accounts/ui/recommended-2/Xargo.toml b/lints/duplicate_mutable_accounts/ui/recommended-2/Xargo.toml
similarity index 100%
rename from lints/duplicate-mutable-accounts/ui/recommended-2/Xargo.toml
rename to lints/duplicate_mutable_accounts/ui/recommended-2/Xargo.toml
diff --git a/lints/duplicate-mutable-accounts/ui/recommended-2/src/lib.rs b/lints/duplicate_mutable_accounts/ui/recommended-2/src/lib.rs
similarity index 100%
rename from lints/duplicate-mutable-accounts/ui/recommended-2/src/lib.rs
rename to lints/duplicate_mutable_accounts/ui/recommended-2/src/lib.rs
diff --git a/lints/duplicate-mutable-accounts/ui/recommended-2/src/lib.stderr b/lints/duplicate_mutable_accounts/ui/recommended-2/src/lib.stderr
similarity index 100%
rename from lints/duplicate-mutable-accounts/ui/recommended-2/src/lib.stderr
rename to lints/duplicate_mutable_accounts/ui/recommended-2/src/lib.stderr
diff --git a/lints/duplicate-mutable-accounts/ui/recommended/Cargo.toml b/lints/duplicate_mutable_accounts/ui/recommended/Cargo.toml
similarity index 100%
rename from lints/duplicate-mutable-accounts/ui/recommended/Cargo.toml
rename to lints/duplicate_mutable_accounts/ui/recommended/Cargo.toml
diff --git a/lints/duplicate-mutable-accounts/ui/recommended/Xargo.toml b/lints/duplicate_mutable_accounts/ui/recommended/Xargo.toml
similarity index 100%
rename from lints/duplicate-mutable-accounts/ui/recommended/Xargo.toml
rename to lints/duplicate_mutable_accounts/ui/recommended/Xargo.toml
diff --git a/lints/duplicate-mutable-accounts/ui/recommended/src/lib.rs b/lints/duplicate_mutable_accounts/ui/recommended/src/lib.rs
similarity index 100%
rename from lints/duplicate-mutable-accounts/ui/recommended/src/lib.rs
rename to lints/duplicate_mutable_accounts/ui/recommended/src/lib.rs
diff --git a/lints/duplicate-mutable-accounts/ui/recommended/src/lib.stderr b/lints/duplicate_mutable_accounts/ui/recommended/src/lib.stderr
similarity index 100%
rename from lints/duplicate-mutable-accounts/ui/recommended/src/lib.stderr
rename to lints/duplicate_mutable_accounts/ui/recommended/src/lib.stderr
diff --git a/lints/duplicate-mutable-accounts/ui/secure/Cargo.toml b/lints/duplicate_mutable_accounts/ui/secure/Cargo.toml
similarity index 100%
rename from lints/duplicate-mutable-accounts/ui/secure/Cargo.toml
rename to lints/duplicate_mutable_accounts/ui/secure/Cargo.toml
diff --git a/lints/duplicate-mutable-accounts/ui/secure/Xargo.toml b/lints/duplicate_mutable_accounts/ui/secure/Xargo.toml
similarity index 100%
rename from lints/duplicate-mutable-accounts/ui/secure/Xargo.toml
rename to lints/duplicate_mutable_accounts/ui/secure/Xargo.toml
diff --git a/lints/duplicate-mutable-accounts/ui/secure/src/lib.rs b/lints/duplicate_mutable_accounts/ui/secure/src/lib.rs
similarity index 100%
rename from lints/duplicate-mutable-accounts/ui/secure/src/lib.rs
rename to lints/duplicate_mutable_accounts/ui/secure/src/lib.rs
diff --git a/lints/duplicate-mutable-accounts/ui/secure/src/lib.stderr b/lints/duplicate_mutable_accounts/ui/secure/src/lib.stderr
similarity index 100%
rename from lints/duplicate-mutable-accounts/ui/secure/src/lib.stderr
rename to lints/duplicate_mutable_accounts/ui/secure/src/lib.stderr

From 8a3dfe47b38b07e53a4ccca55343a59d5ef06ba2 Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Fri, 12 Aug 2022 10:37:24 -0500
Subject: [PATCH 22/24] upgrade toolchain

---
 lints/duplicate_mutable_accounts/Cargo.lock   |  4 +--
 lints/duplicate_mutable_accounts/Cargo.toml   |  2 +-
 .../duplicate_mutable_accounts/rust-toolchain |  2 +-
 .../src/anchor_constraint.rs                  | 26 +++++++++----------
 4 files changed, 17 insertions(+), 17 deletions(-)

diff --git a/lints/duplicate_mutable_accounts/Cargo.lock b/lints/duplicate_mutable_accounts/Cargo.lock
index 739d821..1d625fe 100644
--- a/lints/duplicate_mutable_accounts/Cargo.lock
+++ b/lints/duplicate_mutable_accounts/Cargo.lock
@@ -446,8 +446,8 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "clippy_utils"
-version = "0.1.64"
-source = "git+https://github.com/rust-lang/rust-clippy?rev=0cb0f7636851f9fcc57085cf80197a2ef6db098f#0cb0f7636851f9fcc57085cf80197a2ef6db098f"
+version = "0.1.65"
+source = "git+https://github.com/rust-lang/rust-clippy?rev=2b2190cb5667cdd276a24ef8b9f3692209c54a89#2b2190cb5667cdd276a24ef8b9f3692209c54a89"
 dependencies = [
  "arrayvec",
  "if_chain",
diff --git a/lints/duplicate_mutable_accounts/Cargo.toml b/lints/duplicate_mutable_accounts/Cargo.toml
index 7a2cb05..567f9f5 100644
--- a/lints/duplicate_mutable_accounts/Cargo.toml
+++ b/lints/duplicate_mutable_accounts/Cargo.toml
@@ -30,7 +30,7 @@ name = "recommended-2"
 path = "ui/recommended-2/src/lib.rs"
 
 [dependencies]
-clippy_utils = { git = "https://github.com/rust-lang/rust-clippy", rev = "0cb0f7636851f9fcc57085cf80197a2ef6db098f" }
+clippy_utils = { git = "https://github.com/rust-lang/rust-clippy", rev = "2b2190cb5667cdd276a24ef8b9f3692209c54a89" }
 dylint_linting = "2.0.1"
 if_chain = "1.0.2"
 proc-macro2 = "1.0.40"
diff --git a/lints/duplicate_mutable_accounts/rust-toolchain b/lints/duplicate_mutable_accounts/rust-toolchain
index 2056264..ccdc31c 100644
--- a/lints/duplicate_mutable_accounts/rust-toolchain
+++ b/lints/duplicate_mutable_accounts/rust-toolchain
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2022-06-30"
+channel = "nightly-2022-08-11"
 components = ["llvm-tools-preview", "rustc-dev"]
diff --git a/lints/duplicate_mutable_accounts/src/anchor_constraint.rs b/lints/duplicate_mutable_accounts/src/anchor_constraint.rs
index dada579..4a44c4a 100644
--- a/lints/duplicate_mutable_accounts/src/anchor_constraint.rs
+++ b/lints/duplicate_mutable_accounts/src/anchor_constraint.rs
@@ -2,7 +2,7 @@ use std::default::Default;
 
 use rustc_ast::{
     token::{Delimiter, Token, TokenKind},
-    tokenstream::{DelimSpan, TokenStream, TokenTree, TreeAndSpacing},
+    tokenstream::{DelimSpan, Spacing, TokenStream, TokenTree},
 };
 use rustc_hir::{def::Res, FieldDef, GenericArg, QPath, TyKind};
 use rustc_span::{
@@ -51,23 +51,23 @@ pub fn create_key_check_constraint_tokenstream(a: Symbol, b: Symbol) -> TokenStr
     // TODO: may be more efficient way to do this, since the stream is effectively fixed
     // and determined. Only two tokens are variable.
     let constraint = vec![
-        TreeAndSpacing::from(create_token_from_ident(a.as_str())),
-        TreeAndSpacing::from(TokenTree::Token(Token::new(TokenKind::Dot, DUMMY_SP))),
-        TreeAndSpacing::from(create_token_from_ident("key")),
-        TreeAndSpacing::from(TokenTree::Delimited(
+        create_token_from_ident(a.as_str()),
+        TokenTree::Token(Token::new(TokenKind::Dot, DUMMY_SP), Spacing::Alone),
+        create_token_from_ident("key"),
+        TokenTree::Delimited(
             DelimSpan::dummy(),
             Delimiter::Parenthesis,
             TokenStream::new(vec![]),
-        )),
-        TreeAndSpacing::from(TokenTree::Token(Token::new(TokenKind::Ne, DUMMY_SP))),
-        TreeAndSpacing::from(create_token_from_ident(b.as_str())),
-        TreeAndSpacing::from(TokenTree::Token(Token::new(TokenKind::Dot, DUMMY_SP))),
-        TreeAndSpacing::from(create_token_from_ident("key")),
-        TreeAndSpacing::from(TokenTree::Delimited(
+        ),
+        TokenTree::Token(Token::new(TokenKind::Ne, DUMMY_SP), Spacing::Alone),
+        create_token_from_ident(b.as_str()),
+        TokenTree::Token(Token::new(TokenKind::Dot, DUMMY_SP), Spacing::Alone),
+        create_token_from_ident("key"),
+        TokenTree::Delimited(
             DelimSpan::dummy(),
             Delimiter::Parenthesis,
             TokenStream::new(vec![]),
-        )),
+        ),
     ];
 
     TokenStream::new(constraint)
@@ -76,7 +76,7 @@ pub fn create_key_check_constraint_tokenstream(a: Symbol, b: Symbol) -> TokenStr
 /// Returns a `TokenTree::Token` which has `TokenKind::Ident`, with the string set to `s`.
 fn create_token_from_ident(s: &str) -> TokenTree {
     let ident = Ident::from_str(s);
-    TokenTree::Token(Token::from_ast_ident(ident))
+    TokenTree::Token(Token::from_ast_ident(ident), Spacing::Alone)
 }
 
 #[derive(Debug, Default)]

From 539854415bd7c5e0b28a1dc3fd1effce32a5c9e3 Mon Sep 17 00:00:00 2001
From: Samuel Moelius <samuel.moelius@trailofbits.com>
Date: Sun, 14 Aug 2022 18:12:18 +0000
Subject: [PATCH 23/24] Adjust path names

---
 lints/duplicate_mutable_accounts/src/alternate_constraint.rs | 2 +-
 lints/duplicate_mutable_accounts/src/lib.rs                  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lints/duplicate_mutable_accounts/src/alternate_constraint.rs b/lints/duplicate_mutable_accounts/src/alternate_constraint.rs
index 230d1f9..b95aed5 100644
--- a/lints/duplicate_mutable_accounts/src/alternate_constraint.rs
+++ b/lints/duplicate_mutable_accounts/src/alternate_constraint.rs
@@ -74,7 +74,7 @@ impl<'cx, 'tcx> Visitor<'tcx> for Values<'cx, 'tcx> {
             let middle_ty = self.cx.typeck_results().expr_ty(mut_expr);
             // let mut_expr_def_id = self.cx.tcx.hir().local_def_id(mut_expr.hir_id).to_def_id();
             // let middle_ty = self.cx.tcx.type_of(mut_expr_def_id);
-            if match_type(self.cx, middle_ty, &paths::ANCHOR_ACCOUNT);
+            if match_type(self.cx, middle_ty, &paths::ANCHOR_LANG_ACCOUNT);
             // grab T generic parameter
             if let MiddleTyKind::Adt(_adt_def, substs) = middle_ty.kind();
             if substs.len() == ANCHOR_ACCOUNT_GENERIC_ARG_COUNT;
diff --git a/lints/duplicate_mutable_accounts/src/lib.rs b/lints/duplicate_mutable_accounts/src/lib.rs
index 2ce4a02..611dfe4 100644
--- a/lints/duplicate_mutable_accounts/src/lib.rs
+++ b/lints/duplicate_mutable_accounts/src/lib.rs
@@ -96,7 +96,7 @@ impl<'tcx> LateLintPass<'tcx> for DuplicateMutableAccounts {
                 if_chain! {
                     if let Some(def_id) = get_def_id(field.ty);
                     let middle_ty = cx.tcx.type_of(def_id);
-                    if match_type(cx, middle_ty, &paths::ANCHOR_ACCOUNT);
+                    if match_type(cx, middle_ty, &paths::ANCHOR_LANG_ACCOUNT);
                     if let Some(account_id) = get_anchor_account_type_def_id(field);
                     then {
                         if let Some(v) = self.anchor_accounts.get_mut(&account_id) {

From e3d777b3d3323e985b35ea579a21d1e09076d539 Mon Sep 17 00:00:00 2001
From: Samuel Moelius <samuel.moelius@trailofbits.com>
Date: Sun, 14 Aug 2022 18:26:26 +0000
Subject: [PATCH 24/24] Use shared target directory

---
 lints/duplicate_mutable_accounts/.cargo/config.toml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lints/duplicate_mutable_accounts/.cargo/config.toml b/lints/duplicate_mutable_accounts/.cargo/config.toml
index 46d1571..6f48fa3 100644
--- a/lints/duplicate_mutable_accounts/.cargo/config.toml
+++ b/lints/duplicate_mutable_accounts/.cargo/config.toml
@@ -1,3 +1,6 @@
+[build]
+target-dir = "../../target"
+
 [target.aarch64-apple-darwin]
 linker = "dylint-link"