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Require that const param tys implement `ConstParamTy` 1. Require that const param tys implement `ConstParamTy` instead of using `search_for_adt_const_param_violation` 2. Add `StructuralPartialEq` as a supertrait for `ConstParamTy`, since we need to make sure that we derive *both* `PartialEq` and `Eq` 3. Implement `ConstParamTy` for tuples up to 12 (or whatever the default for tuples is) 4. Add some custom diagnostics to `ConstParamTy` errors, to avoid regressions from (1.). It's still not as great as it could be -- will point out inline in comments. r? `@BoxyUwU`