GATs outlives lint incomplete

[jackh726]

The following should error, but doesn't: https://play.rust-lang.org/?version=nightly&mode=debug&edition=2021&gist=5dfa889a16a936338aa5d346ced567d5

This is in a test, but doesn't have a FIXME:

rust/src/test/ui/generic-associated-types/self-outlives-lint.rs

Line 141 in 51126be

trait IterableTwo {

[jackh726]

GATs issue triage: blocking. We can't change this after GATs are stabilized in a backwards-compatible manner.

[compiler-errors]

@rustbot claim