rust/src/test/run-pass/writealias.rs

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// -*- rust -*-
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type point = {x: int, y: int, mutable z: int};
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fn f(&p: point) { p.z = 13; }
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fn main() {
let mut x: point = {x: 10, y: 11, mutable z: 12};
f(x);
assert (x.z == 13);
}