Auto merge of rust-lang#137982 - matthiaskrgr:rollup-12jvilg, r=matthiaskrgr

Rollup of 12 pull requests

Successful merges:

 - rust-lang#136975 (Look for `python3` first on MacOS, not `py`)
 - rust-lang#137240 (Slightly reformat `std::fs::remove_dir_all` error docs)
 - rust-lang#137303 (Remove `MaybeForgetReturn` suggestion)
 - rust-lang#137463 ([illumos] attempt to use posix_spawn to spawn processes)
 - rust-lang#137722 (`librustdoc`: 2024 edition! 🎊)
 - rust-lang#137758 (fix usage of ty decl macro fragments in attributes)
 - rust-lang#137772 (Fix char count in `Display` for `ByteStr`)
 - rust-lang#137805 (adjust Layout debug printing to match the internal field name)
 - rust-lang#137808 (Do not require that unsafe fields lack drop glue)
 - rust-lang#137913 (Allow struct field default values to reference struct's generics)
 - rust-lang#137963 (Add ``dyn`` keyword to `E0373` examples)
 - rust-lang#137975 (Remove unused `PpMode::needs_hir`)

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

Author: bors

compiler/rustc_abi/src/lib.rs

@@ -1812,7 +1812,7 @@ where
         f.debug_struct("Layout")
             .field("size", size)
             .field("align", align)
-            .field("abi", backend_repr)
+            .field("backend_repr", backend_repr)
             .field("fields", fields)
             .field("largest_niche", largest_niche)
             .field("uninhabited", uninhabited)

compiler/rustc_attr_parsing/src/parser.rs

@@ -473,6 +473,15 @@ impl<'a> MetaItemListParserContext<'a> {
         {
             self.inside_delimiters.next();
             return Some(MetaItemOrLitParser::Lit(lit));
+        } else if let Some(TokenTree::Delimited(.., Delimiter::Invisible(_), inner_tokens)) =
+            self.inside_delimiters.peek()
+        {
+            self.inside_delimiters.next();
+            return MetaItemListParserContext {
+                inside_delimiters: inner_tokens.iter().peekable(),
+                dcx: self.dcx,
+            }
+            .next();
         }
 
         // or a path.

compiler/rustc_data_structures/src/captures.rs

@@ -48,7 +48,6 @@ pub use rustc_index::static_assert_size;
 pub mod aligned;
 pub mod base_n;
 pub mod binary_search_util;
-pub mod captures;
 pub mod fingerprint;
 pub mod flat_map_in_place;
 pub mod flock;

compiler/rustc_data_structures/src/lib.rs

@@ -3,7 +3,7 @@ A captured variable in a closure may not live long enough.
 Erroneous code example:
 
 ```compile_fail,E0373
-fn foo() -> Box<Fn(u32) -> u32> {
+fn foo() -> Box<dyn Fn(u32) -> u32> {
     let x = 0u32;
     Box::new(|y| x + y)
 }
@@ -42,7 +42,7 @@ This approach moves (or copies, where possible) data into the closure, rather
 than taking references to it. For example:
 
 ```
-fn foo() -> Box<Fn(u32) -> u32> {
+fn foo() -> Box<dyn Fn(u32) -> u32> {
     let x = 0u32;
     Box::new(move |y| x + y)
 }

compiler/rustc_error_codes/src/error_codes/E0373.md

@@ -626,7 +626,6 @@ pub enum StashKey {
     MaybeFruTypo,
     CallAssocMethod,
     AssociatedTypeSuggestion,
-    MaybeForgetReturn,
     /// Query cycle detected, stashing in favor of a better error.
     Cycle,
     UndeterminedMacroResolution,

compiler/rustc_errors/src/lib.rs

@@ -278,13 +278,6 @@ hir_analysis_invalid_union_field =
 hir_analysis_invalid_union_field_sugg =
     wrap the field type in `ManuallyDrop<...>`
 
-hir_analysis_invalid_unsafe_field =
-    field must implement `Copy` or be wrapped in `ManuallyDrop<...>` to be unsafe
-    .note = unsafe fields must not have drop side-effects, which is currently enforced via either `Copy` or `ManuallyDrop<...>`
-
-hir_analysis_invalid_unsafe_field_sugg =
-    wrap the field type in `ManuallyDrop<...>`
-
 hir_analysis_late_bound_const_in_apit = `impl Trait` can only mention const parameters from an fn or impl
     .label = const parameter declared here
 

compiler/rustc_hir_analysis/messages.ftl

@@ -70,7 +70,6 @@ fn check_struct(tcx: TyCtxt<'_>, def_id: LocalDefId) {
 
     check_transparent(tcx, def);
     check_packed(tcx, span, def);
-    check_unsafe_fields(tcx, def_id);
 }
 
 fn check_union(tcx: TyCtxt<'_>, def_id: LocalDefId) {
@@ -144,36 +143,6 @@ fn check_union_fields(tcx: TyCtxt<'_>, span: Span, item_def_id: LocalDefId) -> b
     true
 }
 
-/// Check that the unsafe fields do not need dropping.
-fn check_unsafe_fields(tcx: TyCtxt<'_>, item_def_id: LocalDefId) {
-    let span = tcx.def_span(item_def_id);
-    let def = tcx.adt_def(item_def_id);
-
-    let typing_env = ty::TypingEnv::non_body_analysis(tcx, item_def_id);
-    let args = ty::GenericArgs::identity_for_item(tcx, item_def_id);
-
-    for field in def.all_fields() {
-        if !field.safety.is_unsafe() {
-            continue;
-        }
-
-        if !allowed_union_or_unsafe_field(tcx, field.ty(tcx, args), typing_env, span) {
-            let hir::Node::Field(field) = tcx.hir_node_by_def_id(field.did.expect_local()) else {
-                unreachable!("field has to correspond to hir field")
-            };
-            let ty_span = field.ty.span;
-            tcx.dcx().emit_err(errors::InvalidUnsafeField {
-                field_span: field.span,
-                sugg: errors::InvalidUnsafeFieldSuggestion {
-                    lo: ty_span.shrink_to_lo(),
-                    hi: ty_span.shrink_to_hi(),
-                },
-                note: (),
-            });
-        }
-    }
-}
-
 /// Check that a `static` is inhabited.
 fn check_static_inhabited(tcx: TyCtxt<'_>, def_id: LocalDefId) {
     // Make sure statics are inhabited.
@@ -1517,7 +1486,6 @@ fn check_enum(tcx: TyCtxt<'_>, def_id: LocalDefId) {
 
     detect_discriminant_duplicate(tcx, def);
     check_transparent(tcx, def);
-    check_unsafe_fields(tcx, def_id);
 }
 
 /// Part of enum check. Given the discriminants of an enum, errors if two or more discriminants are equal

compiler/rustc_hir_analysis/src/check/check.rs

@@ -187,6 +187,8 @@ pub(super) fn generics_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Generics {
                         Some(parent_did)
                     }
                     Node::TyPat(_) => Some(parent_did),
+                    // Field default values inherit the ADT's generics.
+                    Node::Field(_) => Some(parent_did),
                     _ => None,
                 }
             }

compiler/rustc_hir_analysis/src/collect/generics_of.rs

@@ -710,17 +710,6 @@ pub(crate) struct InvalidUnionField {
     pub note: (),
 }
 
-#[derive(Diagnostic)]
-#[diag(hir_analysis_invalid_unsafe_field, code = E0740)]
-pub(crate) struct InvalidUnsafeField {
-    #[primary_span]
-    pub field_span: Span,
-    #[subdiagnostic]
-    pub sugg: InvalidUnsafeFieldSuggestion,
-    #[note]
-    pub note: (),
-}
-
 #[derive(Diagnostic)]
 #[diag(hir_analysis_return_type_notation_on_non_rpitit)]
 pub(crate) struct ReturnTypeNotationOnNonRpitit<'tcx> {
@@ -742,18 +731,6 @@ pub(crate) struct InvalidUnionFieldSuggestion {
     pub hi: Span,
 }
 
-#[derive(Subdiagnostic)]
-#[multipart_suggestion(
-    hir_analysis_invalid_unsafe_field_sugg,
-    applicability = "machine-applicable"
-)]
-pub(crate) struct InvalidUnsafeFieldSuggestion {
-    #[suggestion_part(code = "std::mem::ManuallyDrop<")]
-    pub lo: Span,
-    #[suggestion_part(code = ">")]
-    pub hi: Span,
-}
-
 #[derive(Diagnostic)]
 #[diag(hir_analysis_return_type_notation_equality_bound)]
 pub(crate) struct ReturnTypeNotationEqualityBound {