old_style
if ((old ? old_style(&s) : new_style(&s)) < 0) {
int decl, old_style(), prototype(const char *, double *);
old_style(an_int, a_const_int, a_number, a_function, a_struct)
old_style = 1;
old_style(arg);
void old_style(char ch);
void old_style(char ch);