refactor: update ast::Mutabiltiy variants

`Mutability` variants were renamed to `Not` and `Mut`
rust-lang/rust#67355

Author: calebcartwright

rustfmt-core/rustfmt-lib/src/expr.rs

@@ -2040,8 +2040,8 @@ fn rewrite_expr_addrof(
     shape: Shape,
 ) -> Option<String> {
     let operator_str = match mutability {
-        ast::Mutability::Immutable => "&",
-        ast::Mutability::Mutable => "&mut ",
+        ast::Mutability::Not => "&",
+        ast::Mutability::Mut => "&mut ",
     };
     rewrite_unary_prefix(context, operator_str, expr, shape)
 }

rustfmt-core/rustfmt-lib/src/items.rs

@@ -1709,7 +1709,7 @@ impl<'a> StaticParts<'a> {
         let (prefix, ty, mutability, expr) = match item.kind {
             ast::ItemKind::Static(ref ty, mutability, ref expr) => ("static", ty, mutability, expr),
             ast::ItemKind::Const(ref ty, ref expr) => {
-                ("const", ty, ast::Mutability::Immutable, expr)
+                ("const", ty, ast::Mutability::Not, expr)
             }
             _ => unreachable!(),
         };
@@ -1735,7 +1735,7 @@ impl<'a> StaticParts<'a> {
             vis: &DEFAULT_VISIBILITY,
             ident: ti.ident,
             ty,
-            mutability: ast::Mutability::Immutable,
+            mutability: ast::Mutability::Not,
             expr_opt: expr_opt.as_ref(),
             defaultness: None,
             span: ti.span,
@@ -1752,7 +1752,7 @@ impl<'a> StaticParts<'a> {
             vis: &ii.vis,
             ident: ii.ident,
             ty,
-            mutability: ast::Mutability::Immutable,
+            mutability: ast::Mutability::Not,
             expr_opt: Some(expr),
             defaultness: Some(ii.defaultness),
             span: ii.span,

rustfmt-core/rustfmt-lib/src/types.rs

@@ -633,8 +633,8 @@ impl Rewrite for ast::Ty {
             }
             ast::TyKind::Ptr(ref mt) => {
                 let prefix = match mt.mutbl {
-                    Mutability::Mutable => "*mut ",
-                    Mutability::Immutable => "*const ",
+                    Mutability::Mut => "*mut ",
+                    Mutability::Not => "*const ",
                 };
 
                 rewrite_unary_prefix(context, prefix, &*mt.ty, shape)

rustfmt-core/rustfmt-lib/src/utils.rs

@@ -127,8 +127,8 @@ pub(crate) fn format_auto(is_auto: ast::IsAuto) -> &'static str {
 #[inline]
 pub(crate) fn format_mutability(mutability: ast::Mutability) -> &'static str {
     match mutability {
-        ast::Mutability::Mutable => "mut ",
-        ast::Mutability::Immutable => "",
+        ast::Mutability::Mut => "mut ",
+        ast::Mutability::Not => "",
     }
 }