Add `Mutability::{is_mut,is_not}`

compiler/rustc_ast/src/ast.rs

@@ -803,6 +803,16 @@ impl Mutability {
             Mutability::Mut => "&mut ",
         }
     }
+
+    /// Return `true` if self is mutable
+    pub fn is_mut(self) -> bool {
+        matches!(self, Self::Mut)
+    }
+
+    /// Return `true` if self is **not** mutable
+    pub fn is_not(self) -> bool {
+        matches!(self, Self::Not)
+    }
 }
 
 /// The kind of borrow in an `AddrOf` expression,

compiler/rustc_ast_lowering/src/lib.rs

@@ -1781,9 +1781,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                     // Given we are only considering `ImplicitSelf` types, we needn't consider
                     // the case where we have a mutable pattern to a reference as that would
                     // no longer be an `ImplicitSelf`.
-                    TyKind::Rptr(_, mt)
-                        if mt.ty.kind.is_implicit_self() && mt.mutbl == ast::Mutability::Mut =>
-                    {
+                    TyKind::Rptr(_, mt) if mt.ty.kind.is_implicit_self() && mt.mutbl.is_mut() => {
                         hir::ImplicitSelfKind::MutRef
                     }
                     TyKind::Rptr(_, mt) if mt.ty.kind.is_implicit_self() => {

compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

@@ -578,7 +578,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
         err.multipart_suggestion_verbose(
             &format!(
                 "consider {}borrowing {value_name}",
-                if borrow_level == hir::Mutability::Mut { "mutably " } else { "" }
+                if borrow_level.is_mut() { "mutably " } else { "" }
             ),
             sugg,
             Applicability::MaybeIncorrect,

compiler/rustc_codegen_cranelift/src/constant.rs

@@ -257,9 +257,9 @@ pub(crate) fn data_id_for_alloc_id(
     mutability: rustc_hir::Mutability,
 ) -> DataId {
     cx.todo.push(TodoItem::Alloc(alloc_id));
-    *cx.anon_allocs.entry(alloc_id).or_insert_with(|| {
-        module.declare_anonymous_data(mutability == rustc_hir::Mutability::Mut, false).unwrap()
-    })
+    *cx.anon_allocs
+        .entry(alloc_id)
+        .or_insert_with(|| module.declare_anonymous_data(mutability.is_mut(), false).unwrap())
 }
 
 fn data_id_for_static(
@@ -343,12 +343,7 @@ fn define_all_allocs(tcx: TyCtxt<'_>, module: &mut dyn Module, cx: &mut Constant
                     }
                 };
                 let data_id = *cx.anon_allocs.entry(alloc_id).or_insert_with(|| {
-                    module
-                        .declare_anonymous_data(
-                            alloc.inner().mutability == rustc_hir::Mutability::Mut,
-                            false,
-                        )
-                        .unwrap()
+                    module.declare_anonymous_data(alloc.inner().mutability.is_mut(), false).unwrap()
                 });
                 (data_id, alloc, None)
             }

compiler/rustc_codegen_llvm/src/intrinsic.rs

@@ -1500,7 +1500,7 @@ fn generic_simd_intrinsic<'ll, 'tcx>(
         let (_, element_ty1) = arg_tys[1].simd_size_and_type(bx.tcx());
         let (_, element_ty2) = arg_tys[2].simd_size_and_type(bx.tcx());
         let (pointer_count, underlying_ty) = match element_ty1.kind() {
-            ty::RawPtr(p) if p.ty == in_elem && p.mutbl == hir::Mutability::Mut => {
+            ty::RawPtr(p) if p.ty == in_elem && p.mutbl.is_mut() => {
                 (ptr_count(element_ty1), non_ptr(element_ty1))
             }
             _ => {

compiler/rustc_hir_analysis/src/coherence/orphan.rs

@@ -292,7 +292,7 @@ fn emit_newtype_suggestion_for_raw_ptr(
     diag: &mut Diagnostic,
 ) {
     if !self_ty.needs_subst() {
-        let mut_key = if ptr_ty.mutbl == rustc_middle::mir::Mutability::Mut { "mut " } else { "" };
+        let mut_key = ptr_ty.mutbl.prefix_str();
         let msg_sugg = "consider introducing a new wrapper type".to_owned();
         let sugg = vec![
             (

compiler/rustc_hir_pretty/src/lib.rs

@@ -398,7 +398,7 @@ impl<'a> State<'a> {
             }
             hir::ForeignItemKind::Static(t, m) => {
                 self.head("static");
-                if m == hir::Mutability::Mut {
+                if m.is_mut() {
                     self.word_space("mut");
                 }
                 self.print_ident(item.ident);
@@ -519,7 +519,7 @@ impl<'a> State<'a> {
             }
             hir::ItemKind::Static(ty, m, expr) => {
                 self.head("static");
-                if m == hir::Mutability::Mut {
+                if m.is_mut() {
                     self.word_space("mut");
                 }
                 self.print_ident(item.ident);

compiler/rustc_hir_typeck/src/check.rs

@@ -197,7 +197,7 @@ fn check_panic_info_fn(
     let arg_is_panic_info = match *inputs[0].kind() {
         ty::Ref(region, ty, mutbl) => match *ty.kind() {
             ty::Adt(ref adt, _) => {
-                adt.did() == panic_info_did && mutbl == hir::Mutability::Not && !region.is_static()
+                adt.did() == panic_info_did && mutbl.is_not() && !region.is_static()
             }
             _ => false,
         },

compiler/rustc_hir_typeck/src/coercion.rs

@@ -452,7 +452,7 @@ impl<'f, 'tcx> Coerce<'f, 'tcx> {
             return Err(err);
         };
 
-        if ty == a && mt_a.mutbl == hir::Mutability::Not && autoderef.step_count() == 1 {
+        if ty == a && mt_a.mutbl.is_not() && autoderef.step_count() == 1 {
             // As a special case, if we would produce `&'a *x`, that's
             // a total no-op. We end up with the type `&'a T` just as
             // we started with.  In that case, just skip it

compiler/rustc_hir_typeck/src/demand.rs

@@ -856,7 +856,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                             ..
                         })) = self.tcx.hir().find(self.tcx.hir().get_parent_node(expr.hir_id))
                         {
-                            if mutability == hir::Mutability::Mut {
+                            if mutability.is_mut() {
                                 // Suppressing this diagnostic, we'll properly print it in `check_expr_assign`
                                 return None;
                             }

compiler/rustc_hir_typeck/src/pat.rs

@@ -702,7 +702,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             };
 
             let mut_var_suggestion = 'block: {
-                if !matches!(mutbl, ast::Mutability::Mut) {
+                if mutbl.is_not() {
                     break 'block None;
                 }
 

compiler/rustc_save_analysis/src/sig.rs

@@ -169,7 +169,7 @@ impl<'hir> Sig for hir::Ty<'hir> {
                 let mut prefix = "&".to_owned();
                 prefix.push_str(&lifetime.name.ident().to_string());
                 prefix.push(' ');
-                if let hir::Mutability::Mut = mt.mutbl {
+                if mt.mutbl.is_mut() {
                     prefix.push_str("mut ");
                 };
 
@@ -332,7 +332,7 @@ impl<'hir> Sig for hir::Item<'hir> {
         match self.kind {
             hir::ItemKind::Static(ref ty, m, ref body) => {
                 let mut text = "static ".to_owned();
-                if m == hir::Mutability::Mut {
+                if m.is_mut() {
                     text.push_str("mut ");
                 }
                 let name = self.ident.to_string();

compiler/rustc_symbol_mangling/src/v0.rs

@@ -621,7 +621,7 @@ impl<'tcx> Printer<'tcx> for &mut SymbolMangler<'tcx> {
                 });
 
                 match inner_ty.kind() {
-                    ty::Str if *mutbl == hir::Mutability::Not => {
+                    ty::Str if mutbl.is_not() => {
                         match ct.kind() {
                             ty::ConstKind::Value(valtree) => {
                                 let slice =

compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs

@@ -1059,7 +1059,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
                 {
                     (
                         mk_result(old_pred.map_bound(|trait_pred| (trait_pred, *ty))),
-                        matches!(mutability, hir::Mutability::Mut),
+                        mutability.is_mut(),
                     )
                 } else {
                     (false, false)
@@ -1348,7 +1348,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
                         .sess
                         .source_map()
                         .span_take_while(span, |c| c.is_whitespace() || *c == '&');
-                    if points_at_arg && mutability == hir::Mutability::Not && refs_number > 0 {
+                    if points_at_arg && mutability.is_not() && refs_number > 0 {
                         err.span_suggestion_verbose(
                             sp,
                             "consider changing this borrow's mutability",