Auto merge of rust-lang#82896 - Dylan-DPC:rollup-9setmme, r=Dylan-DPC

Rollup of 10 pull requests

Successful merges:

 - rust-lang#82047 (bypass auto_da_alloc for metadata files)
 - rust-lang#82415 (expand: Refactor module loading)
 - rust-lang#82557 (Add natvis for Result, NonNull, CString, CStr, and Cow)
 - rust-lang#82613 (Remove Item::kind, use tagged enum. Rename variants to match)
 - rust-lang#82642 (Fix jemalloc usage on OSX)
 - rust-lang#82682 (Implement built-in attribute macro `#[cfg_eval]` + some refactoring)
 - rust-lang#82684 (Disable destination propagation on all mir-opt-levels)
 - rust-lang#82755 (Refactor confirm_builtin_call, remove partial if)
 - rust-lang#82857 (Edit ructc_ast_lowering docs)
 - rust-lang#82862 (Generalize Write impl for Vec<u8> to Vec<u8, A>)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

Diff for: Cargo.lock

@@ -4568,6 +4568,7 @@ name = "rustdoc-json-types"
 version = "0.1.0"
 dependencies = [
  "serde",
+ "serde_json",
 ]
 
 [[package]]

Diff for: compiler/rustc/src/main.rs

@@ -24,6 +24,20 @@ fn main() {
         static _F5: unsafe extern "C" fn(*mut c_void, usize) -> *mut c_void = jemalloc_sys::realloc;
         #[used]
         static _F6: unsafe extern "C" fn(*mut c_void) = jemalloc_sys::free;
+
+        // On OSX, jemalloc doesn't directly override malloc/free, but instead
+        // registers itself with the allocator's zone APIs in a ctor. However,
+        // the linker doesn't seem to consider ctors as "used" when statically
+        // linking, so we need to explicitly depend on the function.
+        #[cfg(target_os = "macos")]
+        {
+            extern "C" {
+                fn _rjem_je_zone_register();
+            }
+
+            #[used]
+            static _F7: unsafe extern "C" fn() = _rjem_je_zone_register;
+        }
     }
 
     rustc_driver::set_sigpipe_handler();

Diff for: compiler/rustc_ast/src/ast.rs

@@ -915,16 +915,6 @@ impl Stmt {
         }
     }
 
-    pub fn tokens_mut(&mut self) -> Option<&mut LazyTokenStream> {
-        match self.kind {
-            StmtKind::Local(ref mut local) => local.tokens.as_mut(),
-            StmtKind::Item(ref mut item) => item.tokens.as_mut(),
-            StmtKind::Expr(ref mut expr) | StmtKind::Semi(ref mut expr) => expr.tokens.as_mut(),
-            StmtKind::Empty => None,
-            StmtKind::MacCall(ref mut mac) => mac.tokens.as_mut(),
-        }
-    }
-
     pub fn has_trailing_semicolon(&self) -> bool {
         match &self.kind {
             StmtKind::Semi(_) => true,

Diff for: compiler/rustc_ast/src/ast_like.rs

@@ -11,13 +11,7 @@ use super::{AttrVec, Attribute, Stmt, StmtKind};
 pub trait AstLike: Sized {
     fn attrs(&self) -> &[Attribute];
     fn visit_attrs(&mut self, f: impl FnOnce(&mut Vec<Attribute>));
-    /// Called by `Parser::collect_tokens` to store the collected
-    /// tokens inside an AST node
-    fn finalize_tokens(&mut self, _tokens: LazyTokenStream) {
-        // This default impl makes this trait easier to implement
-        // in tools like `rust-analyzer`
-        panic!("`finalize_tokens` is not supported!")
-    }
+    fn tokens_mut(&mut self) -> Option<&mut Option<LazyTokenStream>>;
 }
 
 impl<T: AstLike + 'static> AstLike for P<T> {
@@ -27,8 +21,8 @@ impl<T: AstLike + 'static> AstLike for P<T> {
     fn visit_attrs(&mut self, f: impl FnOnce(&mut Vec<Attribute>)) {
         (**self).visit_attrs(f);
     }
-    fn finalize_tokens(&mut self, tokens: LazyTokenStream) {
-        (**self).finalize_tokens(tokens)
+    fn tokens_mut(&mut self) -> Option<&mut Option<LazyTokenStream>> {
+        (**self).tokens_mut()
     }
 }
 
@@ -42,12 +36,12 @@ fn visit_attrvec(attrs: &mut AttrVec, f: impl FnOnce(&mut Vec<Attribute>)) {
 
 impl AstLike for StmtKind {
     fn attrs(&self) -> &[Attribute] {
-        match *self {
-            StmtKind::Local(ref local) => local.attrs(),
-            StmtKind::Expr(ref expr) | StmtKind::Semi(ref expr) => expr.attrs(),
-            StmtKind::Item(ref item) => item.attrs(),
+        match self {
+            StmtKind::Local(local) => local.attrs(),
+            StmtKind::Expr(expr) | StmtKind::Semi(expr) => expr.attrs(),
+            StmtKind::Item(item) => item.attrs(),
             StmtKind::Empty => &[],
-            StmtKind::MacCall(ref mac) => &*mac.attrs,
+            StmtKind::MacCall(mac) => &mac.attrs,
         }
     }
 
@@ -60,17 +54,14 @@ impl AstLike for StmtKind {
             StmtKind::MacCall(mac) => visit_attrvec(&mut mac.attrs, f),
         }
     }
-    fn finalize_tokens(&mut self, tokens: LazyTokenStream) {
-        let stmt_tokens = match self {
-            StmtKind::Local(ref mut local) => &mut local.tokens,
-            StmtKind::Item(ref mut item) => &mut item.tokens,
-            StmtKind::Expr(ref mut expr) | StmtKind::Semi(ref mut expr) => &mut expr.tokens,
-            StmtKind::Empty => return,
-            StmtKind::MacCall(ref mut mac) => &mut mac.tokens,
-        };
-        if stmt_tokens.is_none() {
-            *stmt_tokens = Some(tokens);
-        }
+    fn tokens_mut(&mut self) -> Option<&mut Option<LazyTokenStream>> {
+        Some(match self {
+            StmtKind::Local(local) => &mut local.tokens,
+            StmtKind::Item(item) => &mut item.tokens,
+            StmtKind::Expr(expr) | StmtKind::Semi(expr) => &mut expr.tokens,
+            StmtKind::Empty => return None,
+            StmtKind::MacCall(mac) => &mut mac.tokens,
+        })
     }
 }
 
@@ -82,8 +73,8 @@ impl AstLike for Stmt {
     fn visit_attrs(&mut self, f: impl FnOnce(&mut Vec<Attribute>)) {
         self.kind.visit_attrs(f);
     }
-    fn finalize_tokens(&mut self, tokens: LazyTokenStream) {
-        self.kind.finalize_tokens(tokens)
+    fn tokens_mut(&mut self) -> Option<&mut Option<LazyTokenStream>> {
+        self.kind.tokens_mut()
     }
 }
 
@@ -92,17 +83,13 @@ impl AstLike for Attribute {
         &[]
     }
     fn visit_attrs(&mut self, _f: impl FnOnce(&mut Vec<Attribute>)) {}
-    fn finalize_tokens(&mut self, tokens: LazyTokenStream) {
-        match &mut self.kind {
-            AttrKind::Normal(_, attr_tokens) => {
-                if attr_tokens.is_none() {
-                    *attr_tokens = Some(tokens);
-                }
+    fn tokens_mut(&mut self) -> Option<&mut Option<LazyTokenStream>> {
+        Some(match &mut self.kind {
+            AttrKind::Normal(_, tokens) => tokens,
+            kind @ AttrKind::DocComment(..) => {
+                panic!("Called tokens_mut on doc comment attr {:?}", kind)
             }
-            AttrKind::DocComment(..) => {
-                panic!("Called finalize_tokens on doc comment attr {:?}", self)
-            }
-        }
+        })
     }
 }
 
@@ -115,10 +102,8 @@ impl<T: AstLike> AstLike for Option<T> {
             inner.visit_attrs(f);
         }
     }
-    fn finalize_tokens(&mut self, tokens: LazyTokenStream) {
-        if let Some(inner) = self {
-            inner.finalize_tokens(tokens);
-        }
+    fn tokens_mut(&mut self) -> Option<&mut Option<LazyTokenStream>> {
+        self.as_mut().and_then(|inner| inner.tokens_mut())
     }
 }
 
@@ -152,11 +137,8 @@ macro_rules! derive_has_tokens_and_attrs {
                 VecOrAttrVec::visit(&mut self.attrs, f)
             }
 
-            fn finalize_tokens(&mut self, tokens: LazyTokenStream) {
-                if self.tokens.is_none() {
-                    self.tokens = Some(tokens);
-                }
-
+            fn tokens_mut(&mut self) -> Option<&mut Option<LazyTokenStream>> {
+                Some(&mut self.tokens)
             }
         }
     )* }
@@ -173,7 +155,9 @@ macro_rules! derive_has_attrs_no_tokens {
                 VecOrAttrVec::visit(&mut self.attrs, f)
             }
 
-            fn finalize_tokens(&mut self, _tokens: LazyTokenStream) {}
+            fn tokens_mut(&mut self) -> Option<&mut Option<LazyTokenStream>> {
+                None
+            }
         }
     )* }
 }
@@ -185,14 +169,10 @@ macro_rules! derive_has_tokens_no_attrs {
                 &[]
             }
 
-            fn visit_attrs(&mut self, _f: impl FnOnce(&mut Vec<Attribute>)) {
-            }
-
-            fn finalize_tokens(&mut self, tokens: LazyTokenStream) {
-                if self.tokens.is_none() {
-                    self.tokens = Some(tokens);
-                }
+            fn visit_attrs(&mut self, _f: impl FnOnce(&mut Vec<Attribute>)) {}
 
+            fn tokens_mut(&mut self) -> Option<&mut Option<LazyTokenStream>> {
+                Some(&mut self.tokens)
             }
         }
     )* }

Diff for: compiler/rustc_ast_lowering/src/lib.rs

@@ -12,7 +12,7 @@
 //! For the simpler lowering steps, IDs and spans should be preserved. Unlike
 //! expansion we do not preserve the process of lowering in the spans, so spans
 //! should not be modified here. When creating a new node (as opposed to
-//! 'folding' an existing one), then you create a new ID using `next_id()`.
+//! "folding" an existing one), create a new ID using `next_id()`.
 //!
 //! You must ensure that IDs are unique. That means that you should only use the
 //! ID from an AST node in a single HIR node (you can assume that AST node-IDs
@@ -26,7 +26,7 @@
 //! span and spans don't need to be kept in order, etc. Where code is preserved
 //! by lowering, it should have the same span as in the AST. Where HIR nodes are
 //! new it is probably best to give a span for the whole AST node being lowered.
-//! All nodes should have real spans, don't use dummy spans. Tools are likely to
+//! All nodes should have real spans; don't use dummy spans. Tools are likely to
 //! get confused if the spans from leaf AST nodes occur in multiple places
 //! in the HIR, especially for multiple identifiers.
 
@@ -95,7 +95,7 @@ struct LoweringContext<'a, 'hir: 'a> {
     /// librustc_middle is independent of the parser, we use dynamic dispatch here.
     nt_to_tokenstream: NtToTokenstream,
 
-    /// Used to allocate HIR nodes
+    /// Used to allocate HIR nodes.
     arena: &'hir Arena<'hir>,
 
     /// The items being lowered are collected here.
@@ -128,7 +128,7 @@ struct LoweringContext<'a, 'hir: 'a> {
     is_in_trait_impl: bool,
     is_in_dyn_type: bool,
 
-    /// What to do when we encounter either an "anonymous lifetime
+    /// What to do when we encounter an "anonymous lifetime
     /// reference". The term "anonymous" is meant to encompass both
     /// `'_` lifetimes as well as fully elided cases where nothing is
     /// written at all (e.g., `&T` or `std::cell::Ref<T>`).
@@ -238,11 +238,13 @@ enum ImplTraitContext<'b, 'a> {
     OtherOpaqueTy {
         /// Set of lifetimes that this opaque type can capture, if it uses
         /// them. This includes lifetimes bound since we entered this context.
-        /// For example, in
+        /// For example:
         ///
+        /// ```
         /// type A<'b> = impl for<'a> Trait<'a, Out = impl Sized + 'a>;
+        /// ```
         ///
-        /// the inner opaque type captures `'a` because it uses it. It doesn't
+        /// Here the inner opaque type captures `'a` because it uses it. It doesn't
         /// need to capture `'b` because it already inherits the lifetime
         /// parameter from `A`.
         // FIXME(impl_trait): but `required_region_bounds` will ICE later
@@ -2110,7 +2112,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         hir::FnRetTy::Return(self.arena.alloc(opaque_ty))
     }
 
-    /// Transforms `-> T` into `Future<Output = T>`
+    /// Transforms `-> T` into `Future<Output = T>`.
     fn lower_async_fn_output_type_to_future_bound(
         &mut self,
         output: &FnRetTy,