rust/src/test/run-pass/box-unbox.rs

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type box<T: Copy> = {c: @T};
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fn unbox<T: Copy>(b: box<T>) -> T { return *b.c; }
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fn main() {
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let foo: int = 17;
let bfoo: box<int> = {c: @foo};
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debug!("see what's in our box");
assert (unbox::<int>(bfoo) == foo);
}