rust/tests/ui/regions/regions-infer-call-2.rs

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//@ run-pass
fn takes_two(x: &isize, y: &isize) -> isize { *x + *y }
fn with<T, F>(f: F) -> T where F: FnOnce(&isize) -> T {
f(&20)
}
fn has_one<'a>(x: &'a isize) -> isize {
with(|y| takes_two(x, y))
}
pub fn main() {
assert_eq!(has_one(&2), 22);
}