Validate superclass and module-self-type#2289
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I propose to validate for type application on the superclass and modules-self-type.
This change will allow users to quickly recognize this type specification error.
Note
This change will cause Unexpected error in steep and needs to be corrected.
This is because
RBS::InvalidTypeApplicationErroris not expected to occur in certain cases.https://github.com/soutaro/steep/blob/5705673a6ef631771cda36a77b4dc7c0294a3941/lib/steep/services/signature_service.rb#L297-L298