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#![feature(impl_trait_in_fn_trait_return)]
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use std::fmt::Debug;
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fn a<'a>() -> impl Fn(&'a u8) -> (impl Debug + '_) {
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|x| x
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//~^ ERROR expected generic lifetime parameter, found `'_`
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}
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fn _b<'a>() -> impl Fn(&'a u8) -> (impl Debug + 'a) {
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a()
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}
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fn main() {}
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