public IValue Add(Context context, IValue value)
{
if (value is ListValue)
{
ListValue result = new ListValue(type.GetItemType());
result.AddRange(this);
result.AddRange((ListValue)value);
return(result);
}
else if (value is SetValue)
{
ListValue result = new ListValue(type.GetItemType());
result.AddRange(this);
result.AddRange(((SetValue)value).getItems());
return(result);
}
else
{
throw new SyntaxError("Illegal : List + " + value.GetType().Name);
}
}
