The instructions are from Python bytecode. A simple pass is now presented [here](https://github.com/thautwarm/restrain-jit/blob/e58bf95054ef1288b29fced9bd7064fb86bb845a/restrain_jit/bejulia/julia_vm.py#L248), to avoid successively occurrences of following case: ``` a ::= Push(_) Pop() | Push(_) a Pop() ```
