24 lines
839 B
Rust
24 lines
839 B
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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extern crate sync;
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use sync::RWArc;
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fn main() {
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let x = ~RWArc::new(1);
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let mut y = None;
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x.write_downgrade(|write_mode| {
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y = Some(x.downgrade(write_mode));
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//~^ ERROR cannot infer
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});
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y.unwrap();
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// Adding this line causes a method unification failure instead
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// (&option::unwrap(y)).read(|state| { assert!(*state == 1); })
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}
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