Add regression tests for #23122

Author: dsprenkels

src/test/compile-fail/issue-23122-1.rs

@@ -0,0 +1,22 @@
+// Copyright 2016 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.
+
+trait Next {
+    type Next: Next;
+}
+
+struct GetNext<T: Next> { t: T }
+
+impl<T: Next> Next for GetNext<T> {
+    //~^ ERROR overflow evaluating the requirement
+    type Next = <GetNext<T> as Next>::Next;
+}
+
+fn main() {}

src/test/compile-fail/issue-23122-2.rs

@@ -0,0 +1,22 @@
+// Copyright 2016 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.
+
+trait Next {
+    type Next: Next;
+}
+
+struct GetNext<T: Next> { t: T }
+
+impl<T: Next> Next for GetNext<T> {
+    //~^ ERROR overflow evaluating the requirement
+    type Next = <GetNext<T::Next> as Next>::Next;
+}
+
+fn main() {}