mirror of https://github.com/rust-lang/rust
24 lines
715 B
Rust
24 lines
715 B
Rust
//@ check-pass
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// See issue #109356. We don't want a false positive to the `implied_bounds_entailment` lint.
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use std::borrow::Cow;
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pub trait Trait {
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fn method(self) -> Option<Cow<'static, str>>
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where
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Self: Sized;
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}
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impl<'a> Trait for Cow<'a, str> {
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// If we're not careful here, we'll check `WF(return-type)` using the trait
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// and impl where clauses, requiring that `Cow<'a, str>: Sized`. This is
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// obviously true, but if we pick the `Self: Sized` clause from the trait
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// over the "inherent impl", we will require `'a == 'static`, which triggers
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// the `implied_bounds_entailment` lint.
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fn method(self) -> Option<Cow<'static, str>> {
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None
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}
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}
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fn main() {}
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