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Structurally normalize types as needed in `projection_ty_core` Introduce a `structurally_normalize` callback to `projection_ty_core`, and then use it before we match on the ty kind in `projection_ty_core`. Previously we were only structurally normalizing the return type of the `handle_field` struct, but if we were to (e.g.) apply a deref projection to that type, then the resulting type is not guaranteed to be structurally normalized and any subsequent projections applied would ICE. Fixes https://github.com/rust-lang/trait-system-refactor-initiative/issues/221 I'll leave a few comments inline to explain the changes. r? lcnr --- Also fixes rust-lang/rust#141708
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