static IF0FromByteCode leftArrowScriptToIF0(GazelleV_LeftArrowScript.Script script) {
  ret new IF0FromByteCode(methodMaker -> {
    var stackTop = LASToByteCode(methodMaker).compile(script);
  
    // convert return value to object. push null if no return value
  
    if (stackTop == JVMStackCellType.intValue)
      methodMaker.invokeStatic(Int, Int, "valueOf", int.class);
    else if (stackTop == JVMStackCellType.none)
      methodMaker.add(new ACONST_NULL);
    else
      fail("TODO: add conversion for stack cell type: " + stackTop);
  
    methodMaker.areturn();
  });
}