src/test/compile-fail/sync-rwlock-write-mode-shouldnt-escape.rs


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22

// Copyright 2012 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.

// error-pattern: lifetime of variable does not enclose its declaration
extern crate sync;
use sync::RWLock;
fn main() {
    let x = ~RWLock::new();
    let mut y = None;
    x.write_downgrade(|write_mode| {
        y = Some(write_mode);
    });
    // Adding this line causes a method unification failure instead
    // (&option::unwrap(y)).write(proc() { })
}