rust/src/test/run-pass/regions-infer-call.rs

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fn takes_two(x: &int, y: &int) -> int { *x + *y }
fn has_two(x: &a/int, y: &b/int) -> int {
takes_two(x, y)
}
fn main() {
assert has_two(&20, &2) == 22;
}