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

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