// public string Name;
// public string ArgumentName;
// public Expression Body;
// public Expression Recipient;
override public int Evaluate(EvaluationState state)
{
state.BindFunction(Name, this);
var result = Recipient.Evaluate(state);
return(result);
}
// public string Name;
// public Expression Expression;
// public Expression Recipient;
override public int Evaluate(EvaluationState state)
{
var value = Expression.Evaluate(state);
state.BindVariable(Name, value);
var result = Recipient.Evaluate(state);
return(result);
}