reduceyield.cs

public IEnumerable<Expression> ReduceYield(SymbolTable symbols, Type expectedType)
{
    Expression expression = this;
    while (true)
    {
        Expression result;
        if (expression is YacqExpression)
        {
            result = ((YacqExpression) expression).ReduceOnce(symbols, expectedType);
        }
        else
        {
            result = expression.Reduce();
        }
        yield return result;
        if (result == expression)
        {
            yield break;
        }
        else
        {
            expression = result;
        }
    }
}