if (key != null) _keyName = key.getName(); else _keyName = null;
  public ForeachStatement(Location location,                          Expr objExpr,                          VarExpr key,                          VarExpr value,                          boolean isRef,                          Statement block)  {    super(location);    _objExpr = objExpr;    _key = key;    if (key != null)      _keyName = key.getName();    else      _keyName = null;    _value = value;    _valueName = value.getName();    _isRef = isRef;    _block = block;  }