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extern mod std;
fn main() {
let v =
vec::map2(~[1, 2, 3, 4, 5],
~[true, false, false, true, true],
|i, b| if *b { -(*i) } else { *i } );
log(error, v);
assert (v == ~[-1, 2, 3, -4, -5]);
}
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