parse() function returning IEnumerable?

[rhemsuda]

Hey folks, I'm wondering if anyone can provide an explanation for why this code might be returning a value of type IEnumerable<Option>?

var date = (
    from indexer in RecursiveRecordIndexer.Create("SWAPPRICINGDATA->RCVSIDEPRICINGDATA->PriceDate")
    from parser in new RecursiveRecordContentParser().Create(indexer, DateFormat.yyyyMMdd)
    from result in parse(parser, stringFileData).ToOption()
    select result.Date
);

I would've thought it would return just an Option? Is this something to do with how the from .. in .. syntax works within LINQ? Or am I doing something silly?

[louthy]

Option derives from IEnumerable. Usually, if IEnumerable is picked, over the more concrete Option, it means one of the other types in the LINQ expression isn't returning Option. What does Create return?