CFI: Recursively transform predicates in ty::Dynamic
rather than using identity (Redux)
#123524
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Now that we're using
TypeFolder
, avoiding the instantiation at identity and keeping theProjection
clauses is as simple as not transformingty::Dynamic
- the folder will recursively visit the args for us where needed.This is intended to have the same effect as #123045
This is currently on top of #123521, but if it appears that won't land, it can easily be rebased onto master. Setting as draft until #123521 is merged or rejected.
r? compiler-errors