29 lines
529 B
Rust
29 lines
529 B
Rust
type pair<A,B> = {
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a: A, b: B
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};
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enum rec<A> = _rec<A>;
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type _rec<A> = {
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val: A,
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mut rec: option<@rec<A>>
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};
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fn make_cycle<A:copy>(a: A) {
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let g: @rec<A> = @rec({val: a, mut rec: none});
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g.rec = some(g);
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}
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fn f<A:send copy, B:send copy>(a: A, b: B) -> fn@() -> (A, B) {
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fn@() -> (A, B) { (a, b) }
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}
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fn main() {
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let x = 22_u8;
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let y = 44_u64;
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let z = f(~x, y);
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make_cycle(z);
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let (a, b) = z();
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debug!{"a=%u b=%u", *a as uint, b as uint};
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assert *a == x;
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assert b == y;
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} |