2470   if (const MacroInfo *OtherMI=getMacroInfo(MacroNameTok.getIdentifierInfo())) {  in HandleDefineDirective()  local
2481         SourceMgr.getFileID(OtherMI->getDefinitionLoc())  in HandleDefineDirective()
2487           !MI->isIdenticalTo(*OtherMI, *this,  in HandleDefineDirective()
2491       assert(!OtherMI->isWarnIfUnused());  in HandleDefineDirective()
2500       if (!OtherMI->isUsed() && OtherMI->isWarnIfUnused())  in HandleDefineDirective()
2501         Diag(OtherMI->getDefinitionLoc(), diag::pp_macro_not_used);  in HandleDefineDirective()
2505       if (OtherMI->isBuiltinMacro())  in HandleDefineDirective()
2509       else if (!OtherMI->isAllowRedefinitionsWithoutWarning() &&  in HandleDefineDirective()
2510                !MI->isIdenticalTo(*OtherMI, *this, /*Syntactic=*/LangOpts.MicrosoftExt)) {  in HandleDefineDirective()
2513         Diag(OtherMI->getDefinitionLoc(), diag::note_previous_definition);  in HandleDefineDirective()
2516     if (OtherMI->isWarnIfUnused())  in HandleDefineDirective()
2517       WarnUnusedMacroLocs.erase(OtherMI->getDefinitionLoc());  in HandleDefineDirective()