1 files changed, 19 insertions, 0 deletions
diff --git a/src/fnnop.rs b/src/fnnop.rs
new file mode 100644
index 0000000..871a6ab
--- /dev/null
+++ b/src/fnnop.rs
@@ -0,0 +1,19 @@
+// This module needs the following features.
+//
+//#![feature(unboxed_closures)]
+//#![feature(fn_traits)]
+
+pub struct FnNOP();
+
+impl Fn<()> for FnNOP {
+    extern "rust-call" fn call(&self, _args: ()) {}
+}
+impl FnMut<()> for FnNOP {
+    extern "rust-call" fn call_mut(&mut self, _args: ()) {}
+}
+impl FnOnce<()> for FnNOP {
+    type Output = ();
+    extern "rust-call" fn call_once(self, _args: ()) {}
+}
+
+static mut NOP: FnNOP = FnNOP();