Auto merge of #86821 - cuviper:beta-next, r=Mark-Simulacrum

[beta] backports

- rustfmt: load nested out-of-line mods correctly #86424
- Re-add support for parsing (and pretty-printing) inner-attributes in match body #85193
- Revert "List trait impls before methods from deref in the sidebar ..." #86564
- Revert "Don't load all extern crates unconditionally" #85749

r? `@Mark-Simulacrum`

Author: bors

Diff for: compiler/rustc_ast_pretty/src/pprust/state.rs

@@ -369,6 +369,10 @@ pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::Dere
         self.print_either_attributes(attrs, ast::AttrStyle::Inner, false, true)
     }
 
+    fn print_inner_attributes_no_trailing_hardbreak(&mut self, attrs: &[ast::Attribute]) {
+        self.print_either_attributes(attrs, ast::AttrStyle::Inner, false, false)
+    }
+
     fn print_outer_attributes(&mut self, attrs: &[ast::Attribute]) {
         self.print_either_attributes(attrs, ast::AttrStyle::Outer, false, true)
     }
@@ -1960,6 +1964,7 @@ impl<'a> State<'a> {
                 self.print_expr_as_cond(expr);
                 self.s.space();
                 self.bopen();
+                self.print_inner_attributes_no_trailing_hardbreak(attrs);
                 for arm in arms {
                     self.print_arm(arm);
                 }

Diff for: compiler/rustc_parse/src/parser/expr.rs

@@ -1945,7 +1945,7 @@ impl<'a> Parser<'a> {
     }
 
     /// Parses a `match ... { ... }` expression (`match` token already eaten).
-    fn parse_match_expr(&mut self, attrs: AttrVec) -> PResult<'a, P<Expr>> {
+    fn parse_match_expr(&mut self, mut attrs: AttrVec) -> PResult<'a, P<Expr>> {
         let match_span = self.prev_token.span;
         let lo = self.prev_token.span;
         let scrutinee = self.parse_expr_res(Restrictions::NO_STRUCT_LITERAL, None)?;
@@ -1960,6 +1960,7 @@ impl<'a> Parser<'a> {
             }
             return Err(e);
         }
+        attrs.extend(self.parse_inner_attributes()?);
 
         let mut arms: Vec<Arm> = Vec::new();
         while self.token != token::CloseDelim(token::Brace) {

Diff for: src/librustdoc/core.rs

@@ -1,12 +1,12 @@
-use rustc_ast as ast;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::sync::{self, Lrc};
 use rustc_driver::abort_on_err;
 use rustc_errors::emitter::{Emitter, EmitterWriter};
 use rustc_errors::json::JsonEmitter;
 use rustc_feature::UnstableFeatures;
+use rustc_hir::def::Namespace::TypeNS;
 use rustc_hir::def::Res;
-use rustc_hir::def_id::{DefId, LocalDefId};
+use rustc_hir::def_id::{DefId, LocalDefId, CRATE_DEF_INDEX};
 use rustc_hir::HirId;
 use rustc_hir::{
     intravisit::{self, NestedVisitorMap, Visitor},
@@ -23,7 +23,7 @@ use rustc_session::DiagnosticOutput;
 use rustc_session::Session;
 use rustc_span::source_map;
 use rustc_span::symbol::sym;
-use rustc_span::Span;
+use rustc_span::{Span, DUMMY_SP};
 
 use std::cell::RefCell;
 use std::mem;
@@ -300,17 +300,42 @@ crate fn create_config(
 }
 
 crate fn create_resolver<'a>(
+    externs: config::Externs,
     queries: &Queries<'a>,
     sess: &Session,
 ) -> Rc<RefCell<interface::BoxedResolver>> {
-    let parts = abort_on_err(queries.expansion(), sess).peek();
-    let (krate, resolver, _) = &*parts;
-    let resolver = resolver.borrow().clone();
-
-    let mut loader = crate::passes::collect_intra_doc_links::IntraLinkCrateLoader::new(resolver);
-    ast::visit::walk_crate(&mut loader, krate);
+    let extern_names: Vec<String> = externs
+        .iter()
+        .filter(|(_, entry)| entry.add_prelude)
+        .map(|(name, _)| name)
+        .cloned()
+        .collect();
+
+    let (_, resolver, _) = &*abort_on_err(queries.expansion(), sess).peek();
+    let resolver = resolver.borrow();
+
+    // Before we actually clone it, let's force all the extern'd crates to
+    // actually be loaded, just in case they're only referred to inside
+    // intra-doc links
+    resolver.borrow_mut().access(|resolver| {
+        sess.time("load_extern_crates", || {
+            for extern_name in &extern_names {
+                debug!("loading extern crate {}", extern_name);
+                if let Err(()) = resolver
+                    .resolve_str_path_error(
+                        DUMMY_SP,
+                        extern_name,
+                        TypeNS,
+                        LocalDefId { local_def_index: CRATE_DEF_INDEX }.to_def_id(),
+                  ) {
+                    warn!("unable to resolve external crate {} (do you have an unused `--extern` crate?)", extern_name)
+                  }
+            }
+        });
+    });
 
-    loader.resolver
+    // Now we're good to clone the resolver because everything should be loaded
+    resolver.clone()
 }
 
 crate fn run_global_ctxt(

Diff for: src/librustdoc/html/render/mod.rs

@@ -1887,6 +1887,14 @@ fn sidebar_assoc_items(cx: &Context<'_>, out: &mut Buffer, it: &clean::Item) {
         }
 
         if v.iter().any(|i| i.inner_impl().trait_.is_some()) {
+            if let Some(impl_) = v
+                .iter()
+                .filter(|i| i.inner_impl().trait_.is_some())
+                .find(|i| i.inner_impl().trait_.def_id_full(cache) == cx.cache.deref_trait_did)
+            {
+                sidebar_deref_methods(cx, out, impl_, v);
+            }
+
             let format_impls = |impls: Vec<&Impl>| {
                 let mut links = FxHashSet::default();
 
@@ -1954,14 +1962,6 @@ fn sidebar_assoc_items(cx: &Context<'_>, out: &mut Buffer, it: &clean::Item) {
                 );
                 write_sidebar_links(out, blanket_format);
             }
-
-            if let Some(impl_) = v
-                .iter()
-                .filter(|i| i.inner_impl().trait_.is_some())
-                .find(|i| i.inner_impl().trait_.def_id_full(cache) == cx.cache.deref_trait_did)
-            {
-                sidebar_deref_methods(cx, out, impl_, v);
-            }
         }
     }
 }

Diff for: src/librustdoc/lib.rs

@@ -31,7 +31,6 @@ extern crate tracing;
 // Dependencies listed in Cargo.toml do not need `extern crate`.
 
 extern crate rustc_ast;
-extern crate rustc_ast_lowering;
 extern crate rustc_ast_pretty;
 extern crate rustc_attr;
 extern crate rustc_data_structures;
@@ -714,6 +713,7 @@ fn main_options(options: config::Options) -> MainResult {
     let default_passes = options.default_passes;
     let output_format = options.output_format;
     // FIXME: fix this clone (especially render_options)
+    let externs = options.externs.clone();
     let manual_passes = options.manual_passes.clone();
     let render_options = options.render_options.clone();
     let config = core::create_config(options);
@@ -731,7 +731,7 @@ fn main_options(options: config::Options) -> MainResult {
             // We need to hold on to the complete resolver, so we cause everything to be
             // cloned for the analysis passes to use. Suboptimal, but necessary in the
             // current architecture.
-            let resolver = core::create_resolver(queries, &sess);
+            let resolver = core::create_resolver(externs, queries, &sess);
 
             if sess.has_errors() {
                 sess.fatal("Compilation failed, aborting rustdoc");

Diff for: src/librustdoc/passes/collect_intra_doc_links.rs

@@ -37,9 +37,6 @@ use crate::html::markdown::{markdown_links, MarkdownLink};
 use crate::lint::{BROKEN_INTRA_DOC_LINKS, PRIVATE_INTRA_DOC_LINKS};
 use crate::passes::Pass;
 
-mod early;
-crate use early::IntraLinkCrateLoader;
-
 crate const COLLECT_INTRA_DOC_LINKS: Pass = Pass {
     name: "collect-intra-doc-links",
     run: collect_intra_doc_links,

Diff for: src/librustdoc/passes/collect_intra_doc_links/early.rs

@@ -30,7 +30,7 @@ crate use self::unindent_comments::UNINDENT_COMMENTS;
 mod propagate_doc_cfg;
 crate use self::propagate_doc_cfg::PROPAGATE_DOC_CFG;
 
-crate mod collect_intra_doc_links;
+mod collect_intra_doc_links;
 crate use self::collect_intra_doc_links::COLLECT_INTRA_DOC_LINKS;
 
 mod doc_test_lints;

Diff for: src/librustdoc/passes/mod.rs

@@ -43,10 +43,10 @@ fn syntax() {
                     #![attr]
                 };
     let _ =
-        #[attr] match true
-                    {
-                     #[attr]
-                     _ => false,
+        #[attr] match true {
+                    #![attr]
+                            #[attr]
+                            _ => false,
                 };
     let _ = #[attr] || #[attr] foo;
     let _ = #[attr] move || #[attr] foo;

Diff for: src/test/pretty/ast-stmt-expr-attr.rs

@@ -41,9 +41,16 @@ fn _3() {
 fn _4() {
 
     #[rustc_dummy]
-    match () { _ => (), }
+    match () {
+        #![rustc_dummy]
+        _ => (),
+    }
 
-    let _ = #[rustc_dummy] match () { () => (), };
+    let _ =
+        #[rustc_dummy] match () {
+                           #![rustc_dummy]
+                           () => (),
+                       };
 }
 
 fn _5() {
@@ -164,7 +171,11 @@ fn _11() {
         #[rustc_dummy] loop  {
                            #![rustc_dummy]
                        };
-    let _ = #[rustc_dummy] match false { _ => (), };
+    let _ =
+        #[rustc_dummy] match false {
+                           #![rustc_dummy]
+                           _ => (),
+                       };
     let _ = #[rustc_dummy] || #[rustc_dummy] ();
     let _ = #[rustc_dummy] move || #[rustc_dummy] ();
     let _ =

Diff for: src/test/pretty/stmt_expr_attributes.rs

@@ -0,0 +1,2 @@
+/// This will be referred to by the test docstring
+pub struct Something;

Diff for: src/test/rustdoc-ui/auxiliary/panic-item.rs

@@ -0,0 +1,10 @@
+// aux-crate:priv:issue_66159_1=issue-66159-1.rs
+// compile-flags:-Z unstable-options
+
+// The issue was an ICE which meant that we never actually generated the docs
+// so if we have generated the docs, we're okay.
+// Since we don't generate the docs for the auxiliary files, we can't actually
+// verify that the struct is linked correctly.
+
+// @has issue_66159/index.html
+//! [issue_66159_1::Something]

Diff for: src/test/rustdoc-ui/unused-extern-crate.rs

@@ -30,7 +30,7 @@ fn main() {
     //~^ ERROR an inner attribute is not permitted in this context
 
     let g = match true { #![allow(warnings)] _ => {} };
-    //~^ ERROR an inner attribute is not permitted in this context
+
 
     struct MyStruct { field: u8 }
     let h = MyStruct { #![allow(warnings)] field: 0 };

Diff for: src/test/rustdoc/auxiliary/issue-66159-1.rs

@@ -46,14 +46,6 @@ LL |     let f = [#![allow(warnings)] 1; 0];
    |
    = note: inner attributes, like `#![no_std]`, annotate the item enclosing them, and are usually found at the beginning of source files. Outer attributes, like `#[test]`, annotate the item following them.
 
-error: an inner attribute is not permitted in this context
-  --> $DIR/stmt_expr_attrs_placement.rs:32:26
-   |
-LL |     let g = match true { #![allow(warnings)] _ => {} };
-   |                          ^^^^^^^^^^^^^^^^^^^
-   |
-   = note: inner attributes, like `#![no_std]`, annotate the item enclosing them, and are usually found at the beginning of source files. Outer attributes, like `#[test]`, annotate the item following them.
-
 error: an inner attribute is not permitted in this context
   --> $DIR/stmt_expr_attrs_placement.rs:36:24
    |
@@ -62,5 +54,5 @@ LL |     let h = MyStruct { #![allow(warnings)] field: 0 };
    |
    = note: inner attributes, like `#![no_std]`, annotate the item enclosing them, and are usually found at the beginning of source files. Outer attributes, like `#[test]`, annotate the item following them.
 
-error: aborting due to 8 previous errors
+error: aborting due to 7 previous errors
 

Diff for: src/test/rustdoc/issue-66159.rs

@@ -318,7 +318,7 @@ impl<'ast, 'sess, 'c> ModResolver<'ast, 'sess> {
             self.directory = directory;
         }
         match (sub_mod.ast_mod_kind, sub_mod.items) {
-            (Some(Cow::Borrowed(ast::ModKind::Loaded(items, ast::Inline::No, _))), _) => {
+            (Some(Cow::Borrowed(ast::ModKind::Loaded(items, _, _))), _) => {
                 self.visit_mod_from_ast(&items)
             }
             (Some(Cow::Owned(..)), Cow::Owned(items)) => self.visit_mod_outside_ast(items),

Diff for: src/test/ui/parser/stmt_expr_attrs_placement.rs

@@ -16,6 +16,7 @@ use crate::source_file;
 use crate::{is_nightly_channel, FormatReport, FormatReportFormatterBuilder, Input, Session};
 
 mod configuration_snippet;
+mod mod_resolver;
 mod parser;
 
 const DIFF_CONTEXT_SIZE: usize = 3;