1 files changed, 48 insertions, 0 deletions
diff --git a/tests/ui/impl-trait/in-trait/refine.rs b/tests/ui/impl-trait/in-trait/refine.rs
new file mode 100644
index 000000000..a91f9b3e7
--- /dev/null
+++ b/tests/ui/impl-trait/in-trait/refine.rs
@@ -0,0 +1,48 @@
+#![feature(return_position_impl_trait_in_trait, async_fn_in_trait)]
+#![deny(refining_impl_trait)]
+
+pub trait Foo {
+    fn bar() -> impl Sized;
+}
+
+pub struct A;
+impl Foo for A {
+    fn bar() -> impl Copy {}
+    //~^ ERROR impl method signature does not match trait method signature
+}
+
+pub struct B;
+impl Foo for B {
+    fn bar() {}
+    //~^ ERROR impl method signature does not match trait method signature
+}
+
+pub struct C;
+impl Foo for C {
+    fn bar() -> () {}
+    //~^ ERROR impl method signature does not match trait method signature
+}
+
+struct Private;
+impl Foo for Private {
+    fn bar() -> () {}
+}
+
+pub trait Arg<A> {
+    fn bar() -> impl Sized;
+}
+impl Arg<Private> for A {
+    fn bar() -> () {}
+}
+
+pub trait Late {
+    fn bar<'a>(&'a self) -> impl Sized + 'a;
+}
+
+pub struct D;
+impl Late for D {
+    fn bar(&self) -> impl Copy + '_ {}
+    //~^ ERROR impl method signature does not match trait method signature
+}
+
+fn main() {}