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Jon Ross-PerkinsandDana Jansens
19a7fb08b7
Per discussion at https://github.com/carbon-language/carbon-lang/pull/5875#issuecomment-3137288037, a different approach to the same solution. A key difference is that whereas #5875 would build a `TypeStructure` containing `ConcreteType{error}`, this instead just returns nothing. This means impls with errors can't be compared in the same way, though I'm not sure how much impact that'll really have (I've added a test here to show a case where it seemed interesting to see what effect it'd have, and it seems to have none). --------- Co-authored-by: Dana Jansens <danakj@orodu.net>