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9ae98bc81b
This patch prevents CppComprehensionEngine from endlessly looping when there's a circular #include in the code. We now keep track of the set of currently processed files, and will not re-process a file if it already exists in this set. When we're done with processing a file it is removed from this set. The pragma once directive is not yet implemented, but regardless a mechanism that prevents #include loops even in the absence of pragma once is desired.