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