Add ast.ty_mutable.

src/comp/front/parser.rs

@@ -174,7 +174,12 @@ impure fn parse_ty(parser p) -> @ast.ty {
             }
         }
 
-        case (token.AT) { p.bump(); t = ast.ty_box(parse_ty(p)); }
+        case (token.AT) {
+            p.bump();
+            auto t0 = parse_ty(p);
+            hi = t0.span;
+            t = ast.ty_box(t0);
+        }
 
         case (token.VEC) {
             p.bump();
@@ -193,6 +198,13 @@ impure fn parse_ty(parser p) -> @ast.ty {
             t = ast.ty_tup(elems.node);
         }
 
+        case (token.MUTABLE) {
+            p.bump();
+            auto t0 = parse_ty(p);
+            hi = p.get_span();
+            t = ast.ty_mutable(t0);
+        }
+
         case (token.FN) {
             t = parse_ty_fn(p);
             alt (t) {