874   Optional<SourceRange> findGapAreaBetween(SourceLocation AfterLoc,  in findGapAreaBetween()
878     if (AfterLoc.isMacroID()) {  in findGapAreaBetween()
879       FileID FID = SM.getFileID(AfterLoc);  in findGapAreaBetween()
882         AfterLoc = EI->getExpansionLocEnd();  in findGapAreaBetween()
885     size_t StartDepth = locationDepth(AfterLoc);  in findGapAreaBetween()
887     while (!SM.isWrittenInSameFile(AfterLoc, BeforeLoc)) {  in findGapAreaBetween()
899         assert(SM.isWrittenInSameFile(AfterLoc,  in findGapAreaBetween()
900                                       getEndOfFileOrMacro(AfterLoc)));  in findGapAreaBetween()
902         AfterLoc = getIncludeOrExpansionLoc(AfterLoc);  in findGapAreaBetween()
903         assert(AfterLoc.isValid());  in findGapAreaBetween()
904         AfterLoc = getPreciseTokenLocEnd(AfterLoc);  in findGapAreaBetween()
905         assert(AfterLoc.isValid());  in findGapAreaBetween()
909     AfterLoc = getPreciseTokenLocEnd(AfterLoc);  in findGapAreaBetween()
912     if (AfterLoc.isMacroID() || BeforeLoc.isMacroID())  in findGapAreaBetween()
914     if (!SM.isWrittenInSameFile(AfterLoc, BeforeLoc) ||  in findGapAreaBetween()
915         !SpellingRegion(SM, AfterLoc, BeforeLoc).isInSourceOrder())  in findGapAreaBetween()
917     return {{AfterLoc, BeforeLoc}};  in findGapAreaBetween()