Syntax: Fix mut in impl.

Author: ehuss

RustEnhanced.sublime-syntax

@@ -728,15 +728,15 @@ contexts:
       set: impl-body
     - match: '(?=\bwhere\b)'
       push: impl-where
+    - match: \b(mut|ref)\b
+      scope: storage.modifier.rust
     - match: '{{identifier}}(?=<)'
       scope: entity.name.impl.rust
       push: generic-angles
     - match: '{{identifier}}'
       scope: entity.name.impl.rust
     - match: '&'
       scope: keyword.operator.rust
-    - match: \b(mut|ref)\b
-      scope: storage.modifier.rust
     - match: '''{{identifier}}(?!\'')\b'
       scope: storage.modifier.lifetime.rust
 

syntax_test_rust.rs

@@ -1203,3 +1203,11 @@ pub union Foo<'a, Y: Baz>
 // that we don't accidentally interpret it as a keyword.
 fn union() {}
 // ^^^^^ meta.function entity.name.function
+
+// Ensure that `mut` is a storage modifier.
+impl<A> Thing for &'a mut A {}
+//            ^^^ meta.impl keyword.other
+//                ^ meta.impl keyword.operator
+//                 ^^ meta.impl storage.modifier.lifetime
+//                    ^^^ meta.impl storage.modifier
+//                        ^ meta.impl entity.name.impl