gistfile1.c

      struct mrb_jmpbuf buf;
      int stoff = mrb->c->stack - mrb->c->stbase;
      int cioff = mrb->c->ci - mrb->c->cibase;

      MRB_TRY(&buf) {
        mrb->jmp = &buf;
      }
      MRB_CATCH(&buf) {
        // if rescued from method that was called from this method
        // and didn't have its own rescue
        // fix global state, be careful if stbase or cibase changed
        mrb->c->ci = mrb->c->cibase + cioff;
        regs = mrb->c->stack = mrb->c->stbase + stoff;

        // handle error
      }
      MRB_END_EXC(&buf);