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Simon Peyton Jones authored
Trac #13998 showed that default methods were getting bogus tyvar binder visiblity info; and that it matters in the code genreated by the default-method fill-in mechanism * The actual fix: in TcTyDecls.mkDefaultMethodType, make TyVarBinders with the right visibility info by getting TyConBinders from the class TyCon. (Previously we made up visiblity info, but that caused #13998.) * Define TyCon.tyConTyVarBinders :: [TyConBinder] -> [TyVarBinder] which can build correct forall binders for a) default methods (Trac #13998) b) data constructors This was originally BuildTyCl.mkDataConUnivTyVarBinders * Move mkTyVarBinder, mkTyVarBinders from Type to Var
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