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* doc/bison.texinfo (Decl Summary): Document the "lex_symbol" and "variant" %define variables. (C++ Semantic Values): Split into... (C++ Unions, C++ Variants): these. The latter is new. (C++ Parser Interface): Fix type names. Document parser::syntax_error. Document the fact that locations are not mandatory. (C++ Scanner Interface): Split into... (Split Symbols, Complete Symbols): these. The later is new. (Calc++ Parsing Driver): Use variants. Add more comments. Adjust style. (Calc++ Parser): Declare all the tokens, no longer accept raw characters. Remove %union. Adjust types and printers. Remove destructors. (Calc++ Scanner): Use make_<SYMBOL> functions. Use strerror in error message.