rustc: Implement "mutable?". Add a test case and XFAIL it in rustboot for now.

src/comp/front/ast.rs

@@ -91,6 +91,7 @@ tag pat_ {
 tag mutability {
     mut;
     imm;
+    maybe_mut;
 }
 
 tag opacity {

src/comp/front/parser.rs

@@ -615,6 +615,10 @@ impure fn parse_path(parser p, greed g) -> ast.path {
 impure fn parse_mutability(parser p) -> ast.mutability {
     if (p.peek() == token.MUTABLE) {
         p.bump();
+        if (p.peek() == token.QUES) {
+            p.bump();
+            ret ast.maybe_mut;
+        }
         ret ast.mut;
     }
     ret ast.imm;