rust/src/test/run-pass/exterior.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) { assert (p.z == 12); p.z = 13; assert (p.z == 13); }
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fn main() {
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let a: point = {x: 10, y: 11, mutable z: 12};
let b: @point = @a;
assert (b.z == 12);
f(b);
assert (a.z == 12);
assert (b.z == 13);
}