typedef struct va_start_expression_t va_start_expression_t;
typedef struct va_arg_expression_t va_arg_expression_t;
typedef struct builtin_symbol_expression_t builtin_symbol_expression_t;
typedef struct va_start_expression_t va_start_expression_t;
typedef struct va_arg_expression_t va_arg_expression_t;
typedef struct builtin_symbol_expression_t builtin_symbol_expression_t;