1324   std::optional<SourceRange> findGapAreaBetween(SourceLocation AfterLoc,  in findGapAreaBetween()
1329     if (AfterLoc.isInvalid() || BeforeLoc.isInvalid())  in findGapAreaBetween()
1334     if (AfterLoc.isMacroID()) {  in findGapAreaBetween()
1335       FileID FID = SM.getFileID(AfterLoc);  in findGapAreaBetween()
1338         AfterLoc = EI->getExpansionLocEnd();  in findGapAreaBetween()
1341     size_t StartDepth = locationDepth(AfterLoc);  in findGapAreaBetween()
1343     while (!SM.isWrittenInSameFile(AfterLoc, BeforeLoc)) {  in findGapAreaBetween()
1355         assert(SM.isWrittenInSameFile(AfterLoc,  in findGapAreaBetween()
1356                                       getEndOfFileOrMacro(AfterLoc)));  in findGapAreaBetween()
1358         AfterLoc = getIncludeOrExpansionLoc(AfterLoc);  in findGapAreaBetween()
1359         assert(AfterLoc.isValid());  in findGapAreaBetween()
1360         AfterLoc = getPreciseTokenLocEnd(AfterLoc);  in findGapAreaBetween()
1361         assert(AfterLoc.isValid());  in findGapAreaBetween()
1365     AfterLoc = getPreciseTokenLocEnd(AfterLoc);  in findGapAreaBetween()
1368     if (AfterLoc.isMacroID() || BeforeLoc.isMacroID())  in findGapAreaBetween()
1370     if (!SM.isWrittenInSameFile(AfterLoc, BeforeLoc) ||  in findGapAreaBetween()
1371         !SpellingRegion(SM, AfterLoc, BeforeLoc).isInSourceOrder())  in findGapAreaBetween()
1373     return {{AfterLoc, BeforeLoc}};  in findGapAreaBetween()