Different behaviour between CLI and add-on #2349
Description
When we moved to RBS comment annotations, the Tapioca::Dsl::Compiler base class lost the extend T::Generic. This is a breaking change because most custom compilers out there just use type_member directly without extending T::Generic themselves. That ends up not being an issue thanks to the Spoom rewriting, which adds back those extends.
Somehow, this does not happen for the add-on. It's not clear to me why this is the case yet, but we can at least fix the behaviour temporarily by extending T::Generic only in the add-on while we investigate why the behaviour would be different between the two.