Hello Alexei, OK, so using compiler.h the patch reduces to a fourliner in that file because compiler.h is being included in all the concerned files (parse_binop_rhs.cpp, parser.cpp) already anyway. The sizeof() problem miraculously disappeared... Problem: 1. MSVC does not have __func__, but has __FUNCTION__ 2. MSVC does not have __alignof__, but has __alignof Solution: Added #defines to compiler.h