1287   std::optional<SourceRange> findGapAreaBetween(SourceLocation AfterLoc,  in findGapAreaBetween()
1292     if (AfterLoc.isInvalid() || BeforeLoc.isInvalid())  in findGapAreaBetween()
1297     if (AfterLoc.isMacroID()) {  in findGapAreaBetween()
1298       FileID FID = SM.getFileID(AfterLoc);  in findGapAreaBetween()
1301         AfterLoc = EI->getExpansionLocEnd();  in findGapAreaBetween()
1304     size_t StartDepth = locationDepth(AfterLoc);  in findGapAreaBetween()
1306     while (!SM.isWrittenInSameFile(AfterLoc, BeforeLoc)) {  in findGapAreaBetween()
1318         assert(SM.isWrittenInSameFile(AfterLoc,  in findGapAreaBetween()
1319                                       getEndOfFileOrMacro(AfterLoc)));  in findGapAreaBetween()
1321         AfterLoc = getIncludeOrExpansionLoc(AfterLoc);  in findGapAreaBetween()
1322         assert(AfterLoc.isValid());  in findGapAreaBetween()
1323         AfterLoc = getPreciseTokenLocEnd(AfterLoc);  in findGapAreaBetween()
1324         assert(AfterLoc.isValid());  in findGapAreaBetween()
1328     AfterLoc = getPreciseTokenLocEnd(AfterLoc);  in findGapAreaBetween()
1331     if (AfterLoc.isMacroID() || BeforeLoc.isMacroID())  in findGapAreaBetween()
1333     if (!SM.isWrittenInSameFile(AfterLoc, BeforeLoc) ||  in findGapAreaBetween()
1334         !SpellingRegion(SM, AfterLoc, BeforeLoc).isInSourceOrder())  in findGapAreaBetween()
1336     return {{AfterLoc, BeforeLoc}};  in findGapAreaBetween()