293 static expr *expr4(void), *expr5(void), *expr6(void);
627     e = expr6();  in expr5()
634         f = expr6();  in expr5()
816 static expr *expr6(void)  in expr6()  function
834         e = expr6();  in expr6()
841         return expr6();  in expr6()
845         e = expr6();  in expr6()
859         e = expr6();  in expr6()
875         e = expr6();  in expr6()
890         e = expr6();  in expr6()
1038         f = expr6();  in evaluate()