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        case OP_ELSE:
          FlowPop(OP_IF);
          x=flowptr[flowdepth];
          AddInst(OP_GOTO);
          FlowPush(OP_IF);
          cl->codes[x]=peep=++ptr;
          break;
        case OP_EL:
          AddInst(OP_GOTO);
          y=++ptr;
          FlowPop(OP_IF);
          x=flowptr[flowdepth];
          AddInst(OP_GOTO);
          FlowPush(OP_IF);
          cl->codes[x]=peep=++ptr;
          flowptr[flowdepth-1]=y;
          break;
        case OP_BEGIN:
          FlowPush(OP_BEGIN);
          peep=ptr;
          break;
        case OP_AGAIN:
          FlowPop(OP_BEGIN);
          AddInst2(OP_GOTO,flowptr[flowdepth]);