Auto merge of rust-lang#121810 - matthiaskrgr:rollup-mawij2g, r=matthiaskrgr

Rollup of 8 pull requests

Successful merges:

 - rust-lang#121326 (Detect empty leading where clauses on type aliases)
 - rust-lang#121464 (rustc: Fix wasm64 metadata object files)
 - rust-lang#121681 (Safe Transmute: Revise safety analysis)
 - rust-lang#121753 (Add proper cfg to keep only one AlignmentEnum definition for different target_pointer_widths)
 - rust-lang#121782 (allow statics pointing to mutable statics)
 - rust-lang#121798 (Fix links in rustc doc)
 - rust-lang#121806 (add const test for ptr::metadata)
 - rust-lang#121809 (Remove doc aliases to PATH)

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

Author: bors

Diff for: Cargo.lock

@@ -3646,6 +3646,7 @@ dependencies = [
  "thin-vec",
  "thorin-dwp",
  "tracing",
+ "wasm-encoder",
  "windows",
 ]
 
@@ -6142,6 +6143,15 @@ version = "0.2.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4f186bd2dcf04330886ce82d6f33dd75a7bfcf69ecf5763b89fcde53b6ac9838"
 
+[[package]]
+name = "wasm-encoder"
+version = "0.200.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b9e3fb0c8fbddd78aa6095b850dfeedbc7506cf5f81e633f69cf8f2333ab84b9"
+dependencies = [
+ "leb128",
+]
+
 [[package]]
 name = "wasmparser"
 version = "0.118.2"

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

@@ -403,9 +403,10 @@ impl Default for Generics {
 /// A where-clause in a definition.
 #[derive(Clone, Encodable, Decodable, Debug)]
 pub struct WhereClause {
-    /// `true` if we ate a `where` token: this can happen
-    /// if we parsed no predicates (e.g. `struct Foo where {}`).
-    /// This allows us to pretty-print accurately.
+    /// `true` if we ate a `where` token.
+    ///
+    /// This can happen if we parsed no predicates, e.g., `struct Foo where {}`.
+    /// This allows us to pretty-print accurately and provide correct suggestion diagnostics.
     pub has_where_token: bool,
     pub predicates: ThinVec<WherePredicate>,
     pub span: Span,
@@ -3007,18 +3008,29 @@ pub struct Trait {
 ///
 /// If there is no where clause, then this is `false` with `DUMMY_SP`.
 #[derive(Copy, Clone, Encodable, Decodable, Debug, Default)]
-pub struct TyAliasWhereClause(pub bool, pub Span);
+pub struct TyAliasWhereClause {
+    pub has_where_token: bool,
+    pub span: Span,
+}
+
+/// The span information for the two where clauses on a `TyAlias`.
+#[derive(Copy, Clone, Encodable, Decodable, Debug, Default)]
+pub struct TyAliasWhereClauses {
+    /// Before the equals sign.
+    pub before: TyAliasWhereClause,
+    /// After the equals sign.
+    pub after: TyAliasWhereClause,
+    /// The index in `TyAlias.generics.where_clause.predicates` that would split
+    /// into predicates from the where clause before the equals sign and the ones
+    /// from the where clause after the equals sign.
+    pub split: usize,
+}
 
 #[derive(Clone, Encodable, Decodable, Debug)]
 pub struct TyAlias {
     pub defaultness: Defaultness,
     pub generics: Generics,
-    /// The span information for the two where clauses (before equals, after equals)
-    pub where_clauses: (TyAliasWhereClause, TyAliasWhereClause),
-    /// The index in `generics.where_clause.predicates` that would split into
-    /// predicates from the where clause before the equals and the predicates
-    /// from the where clause after the equals
-    pub where_predicates_split: usize,
+    pub where_clauses: TyAliasWhereClauses,
     pub bounds: GenericBounds,
     pub ty: Option<P<Ty>>,
 }

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

@@ -1079,8 +1079,8 @@ pub fn noop_visit_item_kind<T: MutVisitor>(kind: &mut ItemKind, vis: &mut T) {
         }) => {
             visit_defaultness(defaultness, vis);
             vis.visit_generics(generics);
-            vis.visit_span(&mut where_clauses.0.1);
-            vis.visit_span(&mut where_clauses.1.1);
+            vis.visit_span(&mut where_clauses.before.span);
+            vis.visit_span(&mut where_clauses.after.span);
             visit_bounds(bounds, vis);
             visit_opt(ty, |ty| vis.visit_ty(ty));
         }
@@ -1163,8 +1163,8 @@ pub fn noop_flat_map_assoc_item<T: MutVisitor>(
         }) => {
             visit_defaultness(defaultness, visitor);
             visitor.visit_generics(generics);
-            visitor.visit_span(&mut where_clauses.0.1);
-            visitor.visit_span(&mut where_clauses.1.1);
+            visitor.visit_span(&mut where_clauses.before.span);
+            visitor.visit_span(&mut where_clauses.after.span);
             visit_bounds(bounds, visitor);
             visit_opt(ty, |ty| visitor.visit_ty(ty));
         }
@@ -1257,8 +1257,8 @@ pub fn noop_flat_map_foreign_item<T: MutVisitor>(
         }) => {
             visit_defaultness(defaultness, visitor);
             visitor.visit_generics(generics);
-            visitor.visit_span(&mut where_clauses.0.1);
-            visitor.visit_span(&mut where_clauses.1.1);
+            visitor.visit_span(&mut where_clauses.before.span);
+            visitor.visit_span(&mut where_clauses.after.span);
             visit_bounds(bounds, visitor);
             visit_opt(ty, |ty| visitor.visit_ty(ty));
         }

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

@@ -33,19 +33,20 @@ pub(super) struct ItemLowerer<'a, 'hir> {
 /// clause if it exists.
 fn add_ty_alias_where_clause(
     generics: &mut ast::Generics,
-    mut where_clauses: (TyAliasWhereClause, TyAliasWhereClause),
+    mut where_clauses: TyAliasWhereClauses,
     prefer_first: bool,
 ) {
     if !prefer_first {
-        where_clauses = (where_clauses.1, where_clauses.0);
-    }
-    if where_clauses.0.0 || !where_clauses.1.0 {
-        generics.where_clause.has_where_token = where_clauses.0.0;
-        generics.where_clause.span = where_clauses.0.1;
-    } else {
-        generics.where_clause.has_where_token = where_clauses.1.0;
-        generics.where_clause.span = where_clauses.1.1;
+        (where_clauses.before, where_clauses.after) = (where_clauses.after, where_clauses.before);
     }
+    let where_clause =
+        if where_clauses.before.has_where_token || !where_clauses.after.has_where_token {
+            where_clauses.before
+        } else {
+            where_clauses.after
+        };
+    generics.where_clause.has_where_token = where_clause.has_where_token;
+    generics.where_clause.span = where_clause.span;
 }
 
 impl<'a, 'hir> ItemLowerer<'a, 'hir> {

Diff for: compiler/rustc_ast_passes/messages.ftl

@@ -280,4 +280,5 @@ ast_passes_where_clause_after_type_alias = where clauses are not allowed after t
 
 ast_passes_where_clause_before_type_alias = where clauses are not allowed before the type for type aliases
     .note = see issue #89122 <https://github.com/rust-lang/rust/issues/89122> for more information
-    .suggestion = move it to the end of the type declaration
+    .remove_suggestion = remove this `where`
+    .move_suggestion = move it to the end of the type declaration

Diff for: compiler/rustc_ast_passes/src/ast_validation.rs

@@ -138,38 +138,42 @@ impl<'a> AstValidator<'a> {
         &mut self,
         ty_alias: &TyAlias,
     ) -> Result<(), errors::WhereClauseBeforeTypeAlias> {
-        let before_predicates =
-            ty_alias.generics.where_clause.predicates.split_at(ty_alias.where_predicates_split).0;
-
-        if ty_alias.ty.is_none() || before_predicates.is_empty() {
+        if ty_alias.ty.is_none() || !ty_alias.where_clauses.before.has_where_token {
             return Ok(());
         }
 
-        let mut state = State::new();
-        if !ty_alias.where_clauses.1.0 {
-            state.space();
-            state.word_space("where");
-        } else {
-            state.word_space(",");
-        }
-        let mut first = true;
-        for p in before_predicates {
-            if !first {
-                state.word_space(",");
+        let (before_predicates, after_predicates) =
+            ty_alias.generics.where_clause.predicates.split_at(ty_alias.where_clauses.split);
+        let span = ty_alias.where_clauses.before.span;
+
+        let sugg = if !before_predicates.is_empty() || !ty_alias.where_clauses.after.has_where_token
+        {
+            let mut state = State::new();
+
+            if !ty_alias.where_clauses.after.has_where_token {
+                state.space();
+                state.word_space("where");
             }
-            first = false;
-            state.print_where_predicate(p);
-        }
 
-        let span = ty_alias.where_clauses.0.1;
-        Err(errors::WhereClauseBeforeTypeAlias {
-            span,
-            sugg: errors::WhereClauseBeforeTypeAliasSugg {
+            let mut first = after_predicates.is_empty();
+            for p in before_predicates {
+                if !first {
+                    state.word_space(",");
+                }
+                first = false;
+                state.print_where_predicate(p);
+            }
+
+            errors::WhereClauseBeforeTypeAliasSugg::Move {
                 left: span,
                 snippet: state.s.eof(),
-                right: ty_alias.where_clauses.1.1.shrink_to_hi(),
-            },
-        })
+                right: ty_alias.where_clauses.after.span.shrink_to_hi(),
+            }
+        } else {
+            errors::WhereClauseBeforeTypeAliasSugg::Remove { span }
+        };
+
+        Err(errors::WhereClauseBeforeTypeAlias { span, sugg })
     }
 
     fn with_impl_trait(&mut self, outer: Option<Span>, f: impl FnOnce(&mut Self)) {
@@ -457,8 +461,7 @@ impl<'a> AstValidator<'a> {
     fn check_foreign_ty_genericless(
         &self,
         generics: &Generics,
-        before_where_clause: &TyAliasWhereClause,
-        after_where_clause: &TyAliasWhereClause,
+        where_clauses: &TyAliasWhereClauses,
     ) {
         let cannot_have = |span, descr, remove_descr| {
             self.dcx().emit_err(errors::ExternTypesCannotHave {
@@ -473,14 +476,14 @@ impl<'a> AstValidator<'a> {
             cannot_have(generics.span, "generic parameters", "generic parameters");
         }
 
-        let check_where_clause = |where_clause: &TyAliasWhereClause| {
-            if let TyAliasWhereClause(true, where_clause_span) = where_clause {
-                cannot_have(*where_clause_span, "`where` clauses", "`where` clause");
+        let check_where_clause = |where_clause: TyAliasWhereClause| {
+            if where_clause.has_where_token {
+                cannot_have(where_clause.span, "`where` clauses", "`where` clause");
             }
         };
 
-        check_where_clause(before_where_clause);
-        check_where_clause(after_where_clause);
+        check_where_clause(where_clauses.before);
+        check_where_clause(where_clauses.after);
     }
 
     fn check_foreign_kind_bodyless(&self, ident: Ident, kind: &str, body: Option<Span>) {
@@ -1122,9 +1125,9 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
                     if let Err(err) = self.check_type_alias_where_clause_location(ty_alias) {
                         self.dcx().emit_err(err);
                     }
-                } else if where_clauses.1.0 {
+                } else if where_clauses.after.has_where_token {
                     self.dcx().emit_err(errors::WhereClauseAfterTypeAlias {
-                        span: where_clauses.1.1,
+                        span: where_clauses.after.span,
                         help: self.session.is_nightly_build().then_some(()),
                     });
                 }
@@ -1154,7 +1157,7 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
                 self.check_defaultness(fi.span, *defaultness);
                 self.check_foreign_kind_bodyless(fi.ident, "type", ty.as_ref().map(|b| b.span));
                 self.check_type_no_bounds(bounds, "`extern` blocks");
-                self.check_foreign_ty_genericless(generics, &where_clauses.0, &where_clauses.1);
+                self.check_foreign_ty_genericless(generics, where_clauses);
                 self.check_foreign_item_ascii_only(fi.ident);
             }
             ForeignItemKind::Static(_, _, body) => {
@@ -1477,15 +1480,18 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
         if let AssocItemKind::Type(ty_alias) = &item.kind
             && let Err(err) = self.check_type_alias_where_clause_location(ty_alias)
         {
+            let sugg = match err.sugg {
+                errors::WhereClauseBeforeTypeAliasSugg::Remove { .. } => None,
+                errors::WhereClauseBeforeTypeAliasSugg::Move { snippet, right, .. } => {
+                    Some((right, snippet))
+                }
+            };
             self.lint_buffer.buffer_lint_with_diagnostic(
                 DEPRECATED_WHERE_CLAUSE_LOCATION,
                 item.id,
                 err.span,
                 fluent::ast_passes_deprecated_where_clause_location,
-                BuiltinLintDiagnostics::DeprecatedWhereclauseLocation(
-                    err.sugg.right,
-                    err.sugg.snippet,
-                ),
+                BuiltinLintDiagnostics::DeprecatedWhereclauseLocation(sugg),
             );
         }
 

Diff for: compiler/rustc_ast_passes/src/errors.rs

@@ -515,17 +515,25 @@ pub struct WhereClauseBeforeTypeAlias {
 }
 
 #[derive(Subdiagnostic)]
-#[multipart_suggestion(
-    ast_passes_suggestion,
-    applicability = "machine-applicable",
-    style = "verbose"
-)]
-pub struct WhereClauseBeforeTypeAliasSugg {
-    #[suggestion_part(code = "")]
-    pub left: Span,
-    pub snippet: String,
-    #[suggestion_part(code = "{snippet}")]
-    pub right: Span,
+
+pub enum WhereClauseBeforeTypeAliasSugg {
+    #[suggestion(ast_passes_remove_suggestion, applicability = "machine-applicable", code = "")]
+    Remove {
+        #[primary_span]
+        span: Span,
+    },
+    #[multipart_suggestion(
+        ast_passes_move_suggestion,
+        applicability = "machine-applicable",
+        style = "verbose"
+    )]
+    Move {
+        #[suggestion_part(code = "")]
+        left: Span,
+        snippet: String,
+        #[suggestion_part(code = "{snippet}")]
+        right: Span,
+    },
 }
 
 #[derive(Diagnostic)]