881   Optional<SourceRange> findGapAreaBetween(SourceLocation AfterLoc,  in findGapAreaBetween()
885     if (AfterLoc.isMacroID()) {  in findGapAreaBetween()
886       FileID FID = SM.getFileID(AfterLoc);  in findGapAreaBetween()
889         AfterLoc = EI->getExpansionLocEnd();  in findGapAreaBetween()
892     size_t StartDepth = locationDepth(AfterLoc);  in findGapAreaBetween()
894     while (!SM.isWrittenInSameFile(AfterLoc, BeforeLoc)) {  in findGapAreaBetween()
906         assert(SM.isWrittenInSameFile(AfterLoc,  in findGapAreaBetween()
907                                       getEndOfFileOrMacro(AfterLoc)));  in findGapAreaBetween()
909         AfterLoc = getIncludeOrExpansionLoc(AfterLoc);  in findGapAreaBetween()
910         assert(AfterLoc.isValid());  in findGapAreaBetween()
911         AfterLoc = getPreciseTokenLocEnd(AfterLoc);  in findGapAreaBetween()
912         assert(AfterLoc.isValid());  in findGapAreaBetween()
916     AfterLoc = getPreciseTokenLocEnd(AfterLoc);  in findGapAreaBetween()
919     if (AfterLoc.isMacroID() || BeforeLoc.isMacroID())  in findGapAreaBetween()
921     if (!SM.isWrittenInSameFile(AfterLoc, BeforeLoc) ||  in findGapAreaBetween()
922         !SpellingRegion(SM, AfterLoc, BeforeLoc).isInSourceOrder())  in findGapAreaBetween()
924     return {{AfterLoc, BeforeLoc}};  in findGapAreaBetween()