rust/src/test/compile-fail/issue-22370.rs

// Copyright 2015 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.

// ignore-tidy-linelength

trait A<T=Self> {}

fn f(a: &A) {}
//~^ ERROR E0393
//~| NOTE missing reference to `T`
//~| NOTE because of the default `Self` reference, type parameters must be specified on object types

fn main() {}