1 files changed, 27 insertions, 0 deletions
diff --git a/src/test/ui/unboxed-closures/unboxed-closures-extern-fn.rs b/src/test/ui/unboxed-closures/unboxed-closures-extern-fn.rs
new file mode 100644
index 000000000..677cd259a
--- /dev/null
+++ b/src/test/ui/unboxed-closures/unboxed-closures-extern-fn.rs
@@ -0,0 +1,27 @@
+// run-pass
+// Checks that extern fn pointers implement the full range of Fn traits.
+
+use std::ops::{Fn,FnMut,FnOnce};
+
+fn square(x: isize) -> isize { x * x }
+
+fn call_it<F:Fn(isize)->isize>(f: &F, x: isize) -> isize {
+    f(x)
+}
+
+fn call_it_mut<F:FnMut(isize)->isize>(f: &mut F, x: isize) -> isize {
+    f(x)
+}
+
+fn call_it_once<F:FnOnce(isize)->isize>(f: F, x: isize) -> isize {
+    f(x)
+}
+
+fn main() {
+    let x = call_it(&square, 22);
+    let y = call_it_mut(&mut square, 22);
+    let z = call_it_once(square, 22);
+    assert_eq!(x, square(22));
+    assert_eq!(y, square(22));
+    assert_eq!(z, square(22));
+}