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test that we do not support higher-ranked regions in opaque type inference We already do all the right checks in `check_opaque_type_parameter_valid`, and we have done so since at least 2 years. I collected the tests from https://github.com/rust-lang/rust/pull/116935 and https://github.com/rust-lang/rust/pull/100503 and added some more cc https://github.com/rust-lang/rust/issues/96146 r? `@lcnr`