Add missing case for pat_uniq to syntax::visit

Issue #409

src/comp/syntax/visit.rs

@@ -172,6 +172,7 @@ fn visit_pat<E>(p: @pat, e: E, v: vt<E>) {
       }
       pat_tup(elts) { for elt in elts { v.visit_pat(elt, e, v); } }
       pat_box(inner) { v.visit_pat(inner, e, v); }
+      pat_uniq(inner) { v.visit_pat(inner, e, v); }
       _ { }
     }
 }

src/test/run-pass/alt-implicit-copy-unique.rs

@@ -1,4 +1,3 @@
-// xfail-test
 fn main() {
     let x = ~{mutable a: ~10, b: ~20};
     alt x {

src/test/run-pass/unique-pat-2.rs

@@ -1,5 +1,3 @@
-// xfail-test
-
 type foo = {a: int, b: uint};
 tag bar { u(~foo); w(int); }