Don't require rigid alias's trait to hold See test for write-up. TL;DR is that we don't need the trait bound to hold, since we enforce it during WF. I think this is preferable to introducing (if we even could do so) a more specific hack around coroutine interiors, higher ranked types, etc, since this is just a manifestation of more pervasive issues w/ lifetime erasure in coroutines. This just doesn't manifest in the old solver b/c it doesn't try to prove `T: Trait` holds when rigidly projecting `<T as Trait>::Assoc`. It's pretty clear that this affects quite a few traits (https://github.com/rust-lang/rust/pull/139763), so I think this needs fixing. r? lcnr Fixes https://github.com/rust-lang/trait-system-refactor-initiative/issues/177 |
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