Move non-existant type return test to the ui suite

src/test/ui/issue-53300.rs

@@ -0,0 +1,22 @@
+// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// issue 53300
+
+pub trait A {
+    fn add(&self, b: i32) -> i32;
+}
+
+fn addition() -> Wrapper<impl A> {}
+//~^ ERROR cannot find type `Wrapper` in this scope [E0412]
+
+fn main() {
+    let res = addition();
+}

src/test/ui/issue-53300.stderr

@@ -0,0 +1,9 @@
+error[E0412]: cannot find type `Wrapper` in this scope
+  --> $DIR/issue-53300.rs:17:18
+   |
+LL | fn addition() -> Wrapper<impl A> {}
+   |                  ^^^^^^^ not found in this scope
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0412`.