Consolidate opaque ty and async fn lowering code The codepaths for lowering "regular" opaques and async fn were almost identical, modulo some bookkeeping that seemed pretty easy to consolidate. r? `@cjgillot`
Consolidate opaque ty and async fn lowering code The codepaths for lowering "regular" opaques and async fn were almost identical, modulo some bookkeeping that seemed pretty easy to consolidate. r? `@cjgillot`