Remove unused errs.rs file

This module was removed in #124895, but the actual file was not removed.

compiler/rustc_hir_analysis/src/check/errs.rs

@@ -1,88 +0,0 @@
-use rustc_hir as hir;
-use rustc_lint_defs::builtin::STATIC_MUT_REFS;
-use rustc_middle::ty::{Mutability, TyCtxt};
-use rustc_span::Span;
-
-use crate::errors;
-
-/// Check for shared or mutable references of `static mut` inside expression
-pub(crate) fn maybe_expr_static_mut(tcx: TyCtxt<'_>, expr: hir::Expr<'_>) {
-    let span = expr.span;
-    let hir_id = expr.hir_id;
-    if let hir::ExprKind::AddrOf(borrow_kind, m, expr) = expr.kind
-        && matches!(borrow_kind, hir::BorrowKind::Ref)
-        && path_if_static_mut(expr)
-    {
-        handle_static_mut_ref(
-            tcx,
-            span,
-            span.with_hi(expr.span.lo()),
-            span.shrink_to_hi(),
-            span.edition().at_least_rust_2024(),
-            m,
-            hir_id,
-        );
-    }
-}
-
-/// Check for shared or mutable references of `static mut` inside statement
-pub(crate) fn maybe_stmt_static_mut(tcx: TyCtxt<'_>, stmt: hir::Stmt<'_>) {
-    if let hir::StmtKind::Let(loc) = stmt.kind
-        && let hir::PatKind::Binding(ba, _, _, _) = loc.pat.kind
-        && let hir::ByRef::Yes(rmutbl) = ba.0
-        && let Some(init) = loc.init
-        && path_if_static_mut(init)
-    {
-        handle_static_mut_ref(
-            tcx,
-            init.span,
-            init.span.shrink_to_lo(),
-            init.span.shrink_to_hi(),
-            loc.span.edition().at_least_rust_2024(),
-            rmutbl,
-            stmt.hir_id,
-        );
-    }
-}
-
-fn path_if_static_mut(expr: &hir::Expr<'_>) -> bool {
-    if let hir::ExprKind::Path(qpath) = expr.kind
-        && let hir::QPath::Resolved(_, path) = qpath
-        && let hir::def::Res::Def(def_kind, _) = path.res
-        && let hir::def::DefKind::Static { safety: _, mutability: Mutability::Mut, nested: false } =
-            def_kind
-    {
-        return true;
-    }
-    false
-}
-
-fn handle_static_mut_ref(
-    tcx: TyCtxt<'_>,
-    span: Span,
-    lo: Span,
-    hi: Span,
-    e2024: bool,
-    mutable: Mutability,
-    hir_id: hir::HirId,
-) {
-    if e2024 {
-        let (sugg, shared) = if mutable == Mutability::Mut {
-            (errors::MutRefSugg::Mut { lo, hi }, "mutable")
-        } else {
-            (errors::MutRefSugg::Shared { lo, hi }, "shared")
-        };
-        tcx.dcx().emit_err(errors::StaticMutRef { span, sugg, shared });
-    } else {
-        let (sugg, shared) = if mutable == Mutability::Mut {
-            (errors::MutRefSugg::Mut { lo, hi }, "mutable")
-        } else {
-            (errors::MutRefSugg::Shared { lo, hi }, "shared")
-        };
-        tcx.emit_node_span_lint(STATIC_MUT_REFS, hir_id, span, errors::RefOfMutStatic {
-            span,
-            sugg,
-            shared,
-        });
-    }
-}