57 lines
1.4 KiB
Rust
57 lines
1.4 KiB
Rust
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// Because of #109628, when we compute the implied bounds from `Foo<X>`,
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// we incorrectly get `X: placeholder('x)`.
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// Make sure we ignore these bogus bounds and not use them for anything useful.
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//
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// revisions: fail pass
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// [fail] check-fail
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// [pass] check-pass
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trait Trait {
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type Ty<'a> where Self: 'a;
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}
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impl<T> Trait for T {
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type Ty<'a> = () where Self: 'a;
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}
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struct Foo<T: Trait>(T)
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where
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for<'x> T::Ty<'x>: Sized;
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trait AnotherTrait {
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type Ty2<'a>: 'a;
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}
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#[cfg(fail)]
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mod fail {
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use super::*;
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// implied_bound: `'lt: placeholder('x)`.
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// don't use the bound to prove `'lt: 'static`.
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fn test_lifetime<'lt, T: Trait>(_: Foo<&'lt u8>) {}
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//[fail]~^ ERROR `&'lt u8` does not fulfill the required lifetime
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// implied bound: `T::Ty2<'lt>: placeholder('x)`.
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// don't use the bound to prove `T::Ty2<'lt>: 'static`.
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fn test_alias<'lt, T: AnotherTrait>(_: Foo<T::Ty2::<'lt>>) {}
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//[fail]~^ ERROR `<T as AnotherTrait>::Ty2<'lt>` does not fulfill the required lifetime
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}
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mod pass {
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use super::*;
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// implied_bound: 'static: placeholder('x).
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// don't ice.
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fn test_lifetime<T: Trait>(_: Foo<&'static u8>) {}
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// implied bound: T::Ty2<'static>: placeholder('x).
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// don't add the bound to the environment,
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// otherwise we would fail to infer a value for `'_`.
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fn test_alias<T: AnotherTrait>(_: Foo<T::Ty2::<'static>>) {
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None::<&'static T::Ty2<'_>>;
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}
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}
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fn main() {}
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