2792     const MacroInfo *OtherMI = getMacroInfo(MacroNameTok.getIdentifierInfo());  in HandleDefineDirective()  local
2793     if (!OtherMI || !MI->isIdenticalTo(*OtherMI, *this,  in HandleDefineDirective()
2804   if (const MacroInfo *OtherMI=getMacroInfo(MacroNameTok.getIdentifierInfo())) {  in HandleDefineDirective()  local
2815         SourceMgr.getFileID(OtherMI->getDefinitionLoc())  in HandleDefineDirective()
2821           !MI->isIdenticalTo(*OtherMI, *this,  in HandleDefineDirective()
2825       assert(!OtherMI->isWarnIfUnused());  in HandleDefineDirective()
2834       if (!OtherMI->isUsed() && OtherMI->isWarnIfUnused())  in HandleDefineDirective()
2835         Diag(OtherMI->getDefinitionLoc(), diag::pp_macro_not_used);  in HandleDefineDirective()
2839       if (OtherMI->isBuiltinMacro())  in HandleDefineDirective()
2843       else if (!OtherMI->isAllowRedefinitionsWithoutWarning() &&  in HandleDefineDirective()
2844                !MI->isIdenticalTo(*OtherMI, *this, /*Syntactic=*/LangOpts.MicrosoftExt)) {  in HandleDefineDirective()
2847         Diag(OtherMI->getDefinitionLoc(), diag::note_previous_definition);  in HandleDefineDirective()
2850     if (OtherMI->isWarnIfUnused())  in HandleDefineDirective()
2851       WarnUnusedMacroLocs.erase(OtherMI->getDefinitionLoc());  in HandleDefineDirective()