| // 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. |
| |
| // Test that a by-ref `FnMut` closure gets an error when it tries to |
| // mutate a value. |
| |
| fn call<F>(f: F) where F : Fn() { |
| f(); |
| } |
| |
| fn main() { |
| let mut counter = 0; |
| call(|| { |
| counter += 1; |
| //~^ ERROR cannot assign to data in a captured outer variable in an `Fn` closure |
| }); |
| } |
