rust/src/test/ui/run-pass/impl-trait/universal_multiple_bounds.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.
use std::fmt::Display;
fn foo(f: impl Display + Clone) -> String {
let g = f.clone();
format!("{} + {}", f, g)
}
fn main() {
let sum = foo(format!("22"));
assert_eq!(sum, r"22 + 22");
}