1 files changed, 18 insertions, 0 deletions
diff --git a/src/test/ui/feature-gates/feature-gate-unboxed-closures.rs b/src/test/ui/feature-gates/feature-gate-unboxed-closures.rs
new file mode 100644
index 000000000..ebc5a2536
--- /dev/null
+++ b/src/test/ui/feature-gates/feature-gate-unboxed-closures.rs
@@ -0,0 +1,18 @@
+#![feature(fn_traits)]
+
+struct Test;
+
+impl FnOnce<(u32, u32)> for Test {
+//~^ ERROR the precise format of `Fn`-family traits' type parameters is subject to change
+//~| ERROR manual implementations of `FnOnce` are experimental
+    type Output = u32;
+
+    extern "rust-call" fn call_once(self, (a, b): (u32, u32)) -> u32 {
+        a + b
+    }
+    //~^^^ ERROR rust-call ABI is subject to change
+}
+
+fn main() {
+    assert_eq!(Test(1u32, 2u32), 3u32);
+}