rust/src/test/compile-fail/issue-5239-1.rs

// Copyright 2013 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.

// Regression test for issue #5239

fn main() {
    let x = |ref x: isize| -> isize { x += 1; };
    //~^ ERROR binary assignment operation `+=` cannot be applied to type `&isize`
}