26 lines
551 B
Rust
26 lines
551 B
Rust
// Regression test for #47511: anonymous lifetimes can appear
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// unconstrained in a return type, but only if they appear just once
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// in the input, as the input to a projection.
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fn f(_: X) -> X {
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//~^ ERROR return type references an anonymous lifetime
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unimplemented!()
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}
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fn g<'a>(_: X<'a>) -> X<'a> {
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//~^ ERROR return type references lifetime `'a`, which is not constrained
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unimplemented!()
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}
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type X<'a> = <&'a () as Trait>::Value;
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trait Trait {
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type Value;
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}
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impl<'a> Trait for &'a () {
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type Value = ();
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}
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fn main() {}
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