rust/src/test/compile-fail/issue-21160.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.

struct Bar;

impl Bar {
    fn hash<T>(&self, _: T) {}
}

#[derive(Hash)]
struct Foo(Bar);
//~^ error: `Bar: std::hash::Hash` is not satisfied

fn main() {}