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make_symbol provides a means to construct a full symbol (kind, value, location) in a single shot. It is meant to be a Symbol constructor, parameterized by the symbol kind so that overloading would prevent incorrect kind/value pairs. Unfortunately parameterized constructors do not work well in C++ (unless the parameter also appears as an argument, which is not acceptable), hence the use of a function instead of a constructor. * data/lalr1.cc (b4_symbol_constructor_declaration_) (b4_symbol_constructor_declarations) (b4_symbol_constructor_specialization_) (b4_symbol_constructor_specializations) (b4_symbol_constructor_definition_) (b4_symbol_constructor_definitions): New. Use them where appropriate to generate declaration, declaration of the specializations, and implementations of the templated overloaded function "make_symbol". (variant::variant): Always define a default ctor. Also provide a copy ctor. (symbol_base_type, symbol_type): New ctor overloads for value-less symbols. (symbol_type): Now public, so that functions such as yylex can use it.
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