30 lines
782 B
Rust
30 lines
782 B
Rust
// Regression test for #57639:
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//
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// In the move to universes, this test stopped working. The problem
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// was that when the trait solver was asked to prove `for<'a> T::Item:
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// Foo<'a>` as part of WF checking, it wound up "eagerly committing"
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// to the where clause, which says that `T::Item: Foo<'a>`, but it
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// should instead have been using the bound found in the trait
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// declaration. Pre-universe, this used to work out ok because we got
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// "eager errors" due to the leak check.
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//
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// See [this comment on GitHub][c] for more details.
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//
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//@ check-pass
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//
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// [c]: https://github.com/rust-lang/rust/issues/57639#issuecomment-455685861
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trait Foo<'a> {}
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trait Bar {
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type Item: for<'a> Foo<'a>;
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}
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fn foo<'a, T>(_: T)
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where
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T: Bar,
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T::Item: Foo<'a>,
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{}
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fn main() { }
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