Slim down `InferCtxt` depending on whether we're in the trait solver
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@jdonszelmann is already working on this.
Since Apr 29, 2026.
C-cleanup
T-compiler
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Description
The InferCtxt contains a bunch of fields that are simply unset when we're in the trait solver. It would make sense to make the InferCtxt to be generic over whether it's used in the trait solver
(mostly an issue for myself to keep track of the work)
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