rust/src/test/compile-fail/unboxed-closure-region.rs

// 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 <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 an unboxed closure that captures a free variable by
// reference cannot escape the region of that variable.
fn main() {
    let _f = {
        let x = 0;
        || x //~ ERROR `x` does not live long enough
    };
}