Test for #1374

Author: nikomatsakis

src/test/run-pass/cleanup-copy-mode.rs

@@ -0,0 +1,9 @@
+// xfail-win32
+fn adder(+x: @int, +y: @int) -> int { ret *x + *y; }
+fn failer() -> @int { fail; }
+fn main() {
+    assert(result::failure(task::try {||
+        adder(@2, failer()); ()
+    }));
+}
+