23 lines
819 B
Rust
23 lines
819 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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// error-pattern: cannot infer an appropriate lifetime
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extern mod extra;
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use extra::sync;
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fn main() {
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let x = ~sync::RWlock();
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let mut y = None;
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do x.write_downgrade |write_mode| {
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y = Some(x.downgrade(write_mode));
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}
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// Adding this line causes a method unification failure instead
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// do (&option::unwrap(y)).read { }
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}
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