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

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// error-pattern: cannot infer an appropriate lifetime
use std;
import std::sync;
fn main() {
let x = ~sync::rwlock();
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let mut y = None;
do x.write_downgrade |write_mode| {
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y = Some(x.downgrade(write_mode));
}
// Adding this line causes a method unification failure instead
// do (&option::unwrap(y)).read { }
}