Simplify mutability assert!s

compiler/rustc_hir_typeck/src/coercion.rs

@@ -464,7 +464,7 @@ impl<'f, 'tcx> Coerce<'f, 'tcx> {
             // `self.x` both have `&mut `type would be a move of
             // `self.x`, but we auto-coerce it to `foo(&mut *self.x)`,
             // which is a borrow.
-            assert_eq!(mutbl_b, hir::Mutability::Not); // can only coerce &T -> &U
+            assert!(mutbl_b.is_not()); // can only coerce &T -> &U
             return success(vec![], ty, obligations);
         }
 

compiler/rustc_hir_typeck/src/method/confirm.rs

@@ -199,7 +199,7 @@ impl<'a, 'tcx> ConfirmContext<'a, 'tcx> {
             Some(probe::AutorefOrPtrAdjustment::ToConstPtr) => {
                 target = match target.kind() {
                     &ty::RawPtr(ty::TypeAndMut { ty, mutbl }) => {
-                        assert_eq!(mutbl, hir::Mutability::Mut);
+                        assert!(mutbl.is_mut());
                         self.tcx.mk_ptr(ty::TypeAndMut { mutbl: hir::Mutability::Not, ty })
                     }
                     other => panic!("Cannot adjust receiver type {:?} to const ptr", other),