1 files changed, 37 insertions, 0 deletions
diff --git a/src/test/ui/feature-gates/feature-gate-unboxed-closures-manual-impls.rs b/src/test/ui/feature-gates/feature-gate-unboxed-closures-manual-impls.rs
new file mode 100644
index 000000000..eecf2046c
--- /dev/null
+++ b/src/test/ui/feature-gates/feature-gate-unboxed-closures-manual-impls.rs
@@ -0,0 +1,37 @@
+// Test that manual impls of the `Fn` traits are not possible without
+// a feature gate. In fact, the specialized check for these cases
+// never triggers (yet), because they encounter other problems around
+// angle bracket vs parentheses notation.
+
+#![feature(fn_traits)]
+
+struct Foo;
+impl Fn<()> for Foo {
+//~^ ERROR the precise format of `Fn`-family traits' type parameters is subject to change
+//~| ERROR manual implementations of `Fn` are experimental
+    extern "rust-call" fn call(self, args: ()) -> () {}
+    //~^ ERROR rust-call ABI is subject to change
+}
+struct Foo1;
+impl FnOnce() for Foo1 {
+//~^ ERROR associated type bindings are not allowed here
+//~| ERROR manual implementations of `FnOnce` are experimental
+    extern "rust-call" fn call_once(self, args: ()) -> () {}
+    //~^ ERROR rust-call ABI is subject to change
+}
+struct Bar;
+impl FnMut<()> for Bar {
+//~^ ERROR the precise format of `Fn`-family traits' type parameters is subject to change
+//~| ERROR manual implementations of `FnMut` are experimental
+    extern "rust-call" fn call_mut(&self, args: ()) -> () {}
+    //~^ ERROR rust-call ABI is subject to change
+}
+struct Baz;
+impl FnOnce<()> for Baz {
+//~^ ERROR the precise format of `Fn`-family traits' type parameters is subject to change
+//~| ERROR manual implementations of `FnOnce` are experimental
+    extern "rust-call" fn call_once(&self, args: ()) -> () {}
+    //~^ ERROR rust-call ABI is subject to change
+}
+
+fn main() {}