1 files changed, 22 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-20225.rs b/tests/ui/issues/issue-20225.rs
new file mode 100644
index 000000000..0c8e6e402
--- /dev/null
+++ b/tests/ui/issues/issue-20225.rs
@@ -0,0 +1,22 @@
+#![feature(fn_traits, unboxed_closures)]
+
+struct Foo;
+
+impl<'a, T> Fn<(&'a T,)> for Foo {
+  extern "rust-call" fn call(&self, (_,): (T,)) {}
+  //~^ ERROR: has an incompatible type for trait
+}
+
+impl<'a, T> FnMut<(&'a T,)> for Foo {
+  extern "rust-call" fn call_mut(&mut self, (_,): (T,)) {}
+  //~^ ERROR: has an incompatible type for trait
+}
+
+impl<'a, T> FnOnce<(&'a T,)> for Foo {
+  type Output = ();
+
+  extern "rust-call" fn call_once(self, (_,): (T,)) {}
+  //~^ ERROR: has an incompatible type for trait
+}
+
+fn main() {}