mirror of
https://github.com/rust-lang/rust.git
synced 2025-10-27 02:53:43 +00:00
9fd0972677
stop replacing bivariant args with `'static` when computing closure requirements It is unnecessary, these get constrained when checking that the opaque type is well-formed. It also results in the opaque type no longer being well formed. If you've got `fn foo<'a>() -> impl Sized + 'a` the opaque is `type Opaque<'a, 'aDummy> where 'a: 'aDummy, 'aDummy: 'a` where `'aDummy` is bivariant. If we call `foo::<'b>()` inside of a closure and its return type ends up in a type test, we start out with the WF `Opaque<'b, 'b>`, and then replace the bivariant `'b` with `'static`. `Opaque<'b, 'static>` is no longer well-formed. Given how these type tests are used, I don't think this caused any practical issues. r? types