src/test/ui/impl-trait/universal-two-impl-traits.rs


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// Copyright 2017 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.

#![feature(universal_impl_trait)]

use std::fmt::Debug;

fn foo(x: impl Debug, y: impl Debug) -> String {
    let mut a = x;
    a = y; //~ ERROR mismatched
    format!("{:?}", a)
}

fn main() { }