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c8d904125e
Deeply normalize item bounds in new solver Built on #136863. Fixes https://github.com/rust-lang/trait-system-refactor-initiative/issues/142. Fixes https://github.com/rust-lang/trait-system-refactor-initiative/issues/151. cc https://github.com/rust-lang/trait-system-refactor-initiative/issues/116 First commit reworks candidate preference for projection bounds to prefer param-env projection clauses even if the corresponding trait ref doesn't come from the param-env. Second commit adjusts the associated type item bounds check to deeply normalize in the new solver. This causes some test fallout which I will point out. r? lcnr