lib/Sema/SemaDeclObjC.cpp

498     ObjCInterfaceDecl *SuperClassDecl =
503     if (SuperClassDecl) {
504       (void)DiagnoseUseOfDecl(SuperClassDecl, SuperLoc);
505       SuperClassType = Context.getObjCInterfaceType(SuperClassDecl);
508     if (PrevDecl && !SuperClassDecl) {
516             SuperClassDecl = dyn_cast<ObjCInterfaceDecl>(IDecl);
533       if (!SuperClassDecl) {
540       if (!SuperClassDecl)
546                                    SuperClassDecl->getDeclName(),
549         SuperClassDecl = nullptr;
555       assert(!SuperClassDecl && "Failed to set SuperClassType?");