Where do GenericTypeParamDecls get resolved into Types?

EDIT: Nevermind, I now see that the interface type is set in GTPD's constructor! I don't really understand why it's set to a metatype instead of just a GenericTypeParamType, though?

I'm trying to find where it is that GenericTypeParamDecls get turned into Types. Looks as though TypeDecl::getDeclaredInterfaceType is used but that method doesn't appear to handle GTPDs or its ancestors directly and returns null or ErrorType otherwise? I attached screenshots of what I did manage to find below.


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