Re: try-except in generator methods

Avish wrote:
> How do you know if the "enumeration was aborted"? The calling code
> gets back an IEnumerator and is free to call or not call MoveNext on
> it any number of times.
"for" should call enumerator.Dispose() just like "foreach" does in C#. Compiling your code with my locally patched Boo version and then using
Reflector on it produces this:

public static void Consume()
{
    object[] enumerables = new object[] { Builtins.range(2), Generate() };
    IEnumerator ___iterator12 = Builtins.zip(enumerables);
    try
    {
        while (___iterator12.MoveNext())
        {
            object[] ___temp13 = (object[]) ___iterator12.Current;
            object index = ___temp13[0];
            object value = ___temp13[1];
            Builtins.print(new StringBuilder().Append(index).Append(" =>
").Append(value).ToString());
        }
    }
    finally
    {
        IDisposable ___disposable14 = ___iterator12 as IDisposable;
        if (___disposable14 != null)
        {
            ___disposable14.Dispose();
            // calls ZipEnumerator.Dispose, which in turn calls
Generate.$.Dispose, which then
            // a) does nothing if the iterator has been consumed
completely and thus already ran the ensure block
            // b) runs your ensure block (if the enumeration aborted
early), calling whatever Dispose() method you are referring to
        }
    }
}

I already got generating the correct code for the Generator.$.MoveNext()
and Generator.$.Dispose() methods nearly working.

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