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Rollup merge of #149299 - adwinwhite:next-245-ice, r=lcnr
Fudge infer vars in the cause code of `Obligation` intentionally
Fixes the ICE variant in https://github.com/rust-lang/trait-system-refactor-initiative/issues/245.
Fixes rust-lang/rust#142866.
The detailed cause is in the test comments.
r? `@lcnr`
