Add a compile-fail test for #3255

src/test/compile-fail/noncopyable-match-pattern.rs

@@ -0,0 +1,9 @@
+fn main() {
+    let x = some(unsafe::exclusive(false));
+    match x {
+        some(copy z) => { //~ ERROR copying a noncopyable value
+            do z.with |b| { assert !*b; }
+        }
+        none => fail
+    }
+}