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fix rebasing cycle heads when not reaching a fixpoint fixes https://github.com/rust-lang/trait-system-refactor-initiative/issues/232 annoyingly subtle, imagine the following proof tree - A (no cycle head usages, final result Y) - *ignored* B (depends on A with provisional result X) - A (cycle, provisional result X) - B (using the cache entry here incorrectly assumes A has final result X) r? ``@BoxyUwU``