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From: =?UTF-8?Q?Milan_Stanojevi=C4=87?= <milanst@gmail.com>
Date: Fri, 16 Nov 2012 11:05:35 -0500
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Subject: Re: [Caml-list] confusing type error when using function with
 optional arguments

>> I don't understand why foo1 is fine and foo2 isn't. I would have
>> thought that I can use foo2 wherever I can foo1 since it has a
>> strictly more general type.
>> Am I missing something obvious here?
>
> Its probably due to the optional labels, this works:
> let y = () |! foo2 ?x:None ?y:None

The question is why foo1 doesn't need this and foo2 does.