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The following functions were the only functions that updates the source file: SourceManager::File::DisplaySourceLines() SourceManager::File::FindLinesMatchingRegex() But there we API calls that were using the SourceManager::File and asking it questions, like "is line 12 valid" and that might respond incorrectly if the source file had been updated. <rdar://problem/21269402> llvm-svn: 243551