rb_iseq_struct     19 iseq.h         typedef struct rb_iseq_struct rb_iseq_t;
rb_iseq_struct    118 method.h       typedef struct rb_iseq_struct rb_iseq_t;
rb_iseq_struct    369 vm_core.h          const struct rb_iseq_struct *parent_iseq;
rb_iseq_struct    370 vm_core.h          struct rb_iseq_struct *local_iseq; /* local_iseq->flip_cnt can be modified */