1 files changed, 20 insertions, 0 deletions
diff --git a/src/test/compile-fail/once-cant-copy-stack-once-fn-copy.rs b/src/test/compile-fail/once-cant-copy-stack-once-fn-copy.rs
new file mode 100644
index 00000000000..6f524c0068b
--- /dev/null
+++ b/src/test/compile-fail/once-cant-copy-stack-once-fn-copy.rs
@@ -0,0 +1,20 @@
+// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Though it should be legal to copy a heap-allocated "once fn:Copy",
+// stack closures are not deep-copied, so (counterintuitively) it should be
+// illegal to copy them.
+
+fn foo<'r>(blk: &'r once fn:Copy()) -> (&'r once fn:Copy(), &'r once fn:Copy()) {
+    (copy blk, blk) //~ ERROR copying a value of non-copyable type
+}
+
+fn main() {
+}