// Copyright 2014 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 or the MIT license // , at your // option. This file may not be copied, modified, or distributed // except according to those terms. // Test that an unboxed closure that mutates a free variable will // cause borrow conflicts. fn main() { let mut x = 0; let f = || x += 1; let _y = x; //~ ERROR cannot use `x` because it was mutably borrowed }