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

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//@ run-pass

fn hrtb(f: impl Fn(&u32) -> u32) -> u32 {
    f(&22) + f(&44)
}

fn main() {
    let sum = hrtb(|x| x * 2);
    assert_eq!(sum, 22*2 + 44*2);
}
Add `// run-pass` to collection of tests. 2018-09-06 12:41:12 +00:00			`//@ run-pass`

add some more positive tests It'd be good to have a positive test for each case where it is allowed, I should think. 2017-11-13 19:16:34 +00:00			`fn hrtb(f: impl Fn(&u32) -> u32) -> u32 {`
			`f(&22) + f(&44)`
			`}`

			`fn main() {`
			`let sum = hrtb(\|x\| x * 2);`
			`assert_eq!(sum, 222 + 442);`
			`}`