rust/tests/ui/impl-trait/universal_hrtb_named.rs

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// run-pass
fn hrtb(f: impl for<'a> Fn(&'a u32) -> &'a u32) -> u32 {
f(&22) + f(&44)
}
fn main() {
let sum = hrtb(|x| x);
assert_eq!(sum, 22 + 44);
}