1 files changed, 30 insertions, 0 deletions
diff --git a/src/test/ui/overloaded/overloaded-calls-zero-args.rs b/src/test/ui/overloaded/overloaded-calls-zero-args.rs
new file mode 100644
index 000000000..69ca88619
--- /dev/null
+++ b/src/test/ui/overloaded/overloaded-calls-zero-args.rs
@@ -0,0 +1,30 @@
+// run-pass
+
+#![feature(unboxed_closures, fn_traits)]
+
+use std::ops::FnMut;
+
+struct S {
+    x: i32,
+    y: i32,
+}
+
+impl FnMut<()> for S {
+    extern "rust-call" fn call_mut(&mut self, (): ()) -> i32 {
+        self.x * self.y
+    }
+}
+
+impl FnOnce<()> for S {
+    type Output = i32;
+    extern "rust-call" fn call_once(mut self, args: ()) -> i32 { self.call_mut(args) }
+}
+
+fn main() {
+    let mut s = S {
+        x: 3,
+        y: 3,
+    };
+    let ans = s();
+    assert_eq!(ans, 9);
+}