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Distinguishes parts that come from the parser and lexer. It used to be that all the files were called "syntax*", but lexing and parsing are distinct phases that are easier to keep track of when distinguished. syntax.yy.cpp being the source file generated by flex, containing the lexer was particularly confusing, because the yy tends to indicate it is a yacc/Bison product, and the ".tab." substring, indicating "tables" is not really useful to the developer. These names also match up with what Bison's C++ example uses, which will make the transition easier.