2e70d95cdb
It's not clear to me (klinvill) that UserTypeProjections are produced anymore with the removal of type ascriptions as per https://github.com/rust-lang/rfcs/pull/3307. Furthermore, it's not clear to me which variants of ProjectionElem could appear in such projections. For these reasons, I'm reverting projections in UserTypeProjections to simple strings until I can get more clarity on UserTypeProjections.