rb_iseq_first_lineno  629 proc.c         	loc[1] = INT2FIX(rb_iseq_first_lineno(iseq));
rb_iseq_first_lineno  727 proc.c         	    line_no = rb_iseq_first_lineno(iseq);
rb_iseq_first_lineno  442 vm_core.h      int rb_iseq_first_lineno(rb_iseq_t *iseq);