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Don't emit same goal as input during `wf::unnormalized_obligations` r? `@aliemjay` cc `@lcnr` I accidentally pruned the logic to handle `WF(?0)` when writing `wf::unnormalized_obligations`. idk if you wanted to construct a test first, but this is an obvious fix. Copied the comment from above. Fixes rust-lang/trait-system-refactor-initiative#36