27 lines
446 B
Rust
27 lines
446 B
Rust
// Adapted from rustc ui test suite (ui/type-alias-impl-trait/issue-72793.rs)
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#![feature(type_alias_impl_trait)]
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pub trait T {
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type Item;
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}
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pub type Alias<'a> = impl T<Item = &'a ()>;
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struct S;
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impl<'a> T for &'a S {
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type Item = &'a ();
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}
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#[define_opaque(Alias)]
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pub fn filter_positive<'a>() -> Alias<'a> {
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&S
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}
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fn with_positive(fun: impl Fn(Alias<'_>)) {
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fun(filter_positive());
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}
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fn main() {
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with_positive(|_| ());
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}
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