bool bus_type_is_valid(char c) _const_;
bool bus_type_is_valid_in_signature(char c) _const_;
bool bus_type_is_basic(char c) _const_;
bool bus_type_is_valid(char c) _const_;
bool bus_type_is_valid_in_signature(char c) _const_;
bool bus_type_is_basic(char c) _const_;