Disallow hidden references to mutable static

compiler/rustc_hir_analysis/messages.ftl

@@ -467,25 +467,6 @@ hir_analysis_start_not_target_feature = `#[start]` function is not allowed to ha
 hir_analysis_start_not_track_caller = `#[start]` function is not allowed to be `#[track_caller]`
     .label = `#[start]` function is not allowed to be `#[track_caller]`
 
-hir_analysis_static_mut_ref = creating a {$shared} reference to a mutable static
-    .label = {$shared} reference to mutable static
-    .note = {$shared ->
-        [shared] this shared reference has lifetime `'static`, but if the static ever gets mutated, or a mutable reference is created, then any further use of this shared reference is Undefined Behavior
-        *[mutable] this mutable reference has lifetime `'static`, but if the static gets accessed (read or written) by any other means, or any other reference is created, then any further use of this mutable reference is Undefined Behavior
-    }
-    .suggestion = use `addr_of!` instead to create a raw pointer
-    .suggestion_mut = use `addr_of_mut!` instead to create a raw pointer
-
-hir_analysis_static_mut_refs_lint = creating a {$shared} reference to mutable static is discouraged
-    .label = {$shared} reference to mutable static
-    .suggestion = use `addr_of!` instead to create a raw pointer
-    .suggestion_mut = use `addr_of_mut!` instead to create a raw pointer
-    .note = this will be a hard error in the 2024 edition
-    .why_note = {$shared ->
-        [shared] this shared reference has lifetime `'static`, but if the static ever gets mutated, or a mutable reference is created, then any further use of this shared reference is Undefined Behavior
-        *[mutable] this mutable reference has lifetime `'static`, but if the static gets accessed (read or written) by any other means, or any other reference is created, then any further use of this mutable reference is Undefined Behavior
-    }
-
 hir_analysis_static_specialize = cannot specialize on `'static` lifetime
 
 hir_analysis_tait_forward_compat = item constrains opaque type that is not in its signature

compiler/rustc_hir_analysis/src/check/mod.rs

@@ -66,7 +66,6 @@ mod check;
 mod compare_impl_item;
 pub mod dropck;
 mod entry;
-mod errs;
 pub mod intrinsic;
 pub mod intrinsicck;
 mod region;

compiler/rustc_hir_analysis/src/check/region.rs

@@ -20,8 +20,6 @@ use rustc_middle::ty::TyCtxt;
 use rustc_span::source_map;
 use tracing::debug;
 
-use super::errs::{maybe_expr_static_mut, maybe_stmt_static_mut};
-
 #[derive(Debug, Copy, Clone)]
 struct Context {
     /// The scope that contains any new variables declared, plus its depth in
@@ -229,8 +227,6 @@ fn resolve_stmt<'tcx>(visitor: &mut RegionResolutionVisitor<'tcx>, stmt: &'tcx h
     let stmt_id = stmt.hir_id.local_id;
     debug!("resolve_stmt(stmt.id={:?})", stmt_id);
 
-    maybe_stmt_static_mut(visitor.tcx, *stmt);
-
     // Every statement will clean up the temporaries created during
     // execution of that statement. Therefore each statement has an
     // associated destruction scope that represents the scope of the
@@ -249,8 +245,6 @@ fn resolve_stmt<'tcx>(visitor: &mut RegionResolutionVisitor<'tcx>, stmt: &'tcx h
 fn resolve_expr<'tcx>(visitor: &mut RegionResolutionVisitor<'tcx>, expr: &'tcx hir::Expr<'tcx>) {
     debug!("resolve_expr - pre-increment {} expr = {:?}", visitor.expr_and_pat_count, expr);
 
-    maybe_expr_static_mut(visitor.tcx, *expr);
-
     let prev_cx = visitor.cx;
     visitor.enter_node_scope_with_dtor(expr.hir_id.local_id);
 

compiler/rustc_hir_analysis/src/errors.rs

@@ -1522,57 +1522,6 @@ pub(crate) struct OnlyCurrentTraitsPointerSugg<'a> {
     pub ptr_ty: Ty<'a>,
 }
 
-#[derive(Diagnostic)]
-#[diag(hir_analysis_static_mut_ref, code = E0796)]
-#[note]
-pub(crate) struct StaticMutRef<'a> {
-    #[primary_span]
-    #[label]
-    pub span: Span,
-    #[subdiagnostic]
-    pub sugg: MutRefSugg,
-    pub shared: &'a str,
-}
-
-#[derive(Subdiagnostic)]
-pub(crate) enum MutRefSugg {
-    #[multipart_suggestion(
-        hir_analysis_suggestion,
-        style = "verbose",
-        applicability = "maybe-incorrect"
-    )]
-    Shared {
-        #[suggestion_part(code = "addr_of!(")]
-        lo: Span,
-        #[suggestion_part(code = ")")]
-        hi: Span,
-    },
-    #[multipart_suggestion(
-        hir_analysis_suggestion_mut,
-        style = "verbose",
-        applicability = "maybe-incorrect"
-    )]
-    Mut {
-        #[suggestion_part(code = "addr_of_mut!(")]
-        lo: Span,
-        #[suggestion_part(code = ")")]
-        hi: Span,
-    },
-}
-
-// STATIC_MUT_REF lint
-#[derive(LintDiagnostic)]
-#[diag(hir_analysis_static_mut_refs_lint)]
-#[note]
-#[note(hir_analysis_why_note)]
-pub(crate) struct RefOfMutStatic<'a> {
-    #[label]
-    pub span: Span,
-    #[subdiagnostic]
-    pub sugg: MutRefSugg,
-    pub shared: &'a str,
-}
-
 #[derive(Diagnostic)]
 #[diag(hir_analysis_not_supported_delegation)]
 pub(crate) struct UnsupportedDelegation<'a> {