I don't see an intersection, what do you mean?
Thanks,
Ambrose
On Thu, Apr 16, 2015 at 4:43 PM, Sven Richter <sver...@googlemail.com>
wrote:
> Hi,
>
> I tried both destructuring and the nth form instead of second and first.
> None of which worked.
>
> However, if I change the Union to Intersection in
>
> (t/HVec [Keyword (t/U Keyword (t/HVec [Keyword Number])) t/Any t/Any *])
>
> it works for the definition of the multimethod. Does that make sense? I
> thought Union was either one type or the other.
>
> Thanks,
> Sven
>
>
> Am Donnerstag, 16. April 2015 21:44:25 UTC+2 schrieb Ambrose
> Bonnaire-Sergeant:
>>
>> I don't think second's type is is smart enough.
>>
>> Try using nth or destructuring instead:
>>
>> (let [[f s] v]
>> (if (vector? s) (first s) s))
>>
>> or
>>
>> (if (vector? (nth v 1)) (first (nth v 1)) s)
>>
>> Thanks,
>> Ambrose
>>
>> On Thu, Apr 16, 2015 at 3:39 PM, Sven Richter <sve...@googlemail.com>
>> wrote:
>>
>>> Hi,
>>>
>>> I have this code:
>>>
>>> (defalias html-label (t/HVec [Keyword (t/HMap :mandatory {:for String})
>>> String]))
>>> (defalias html-form (t/HVec [Keyword (t/HMap :mandatory {:id String}) t/Any
>>> *]))
>>> (defalias html-form-group (t/HVec [html-label html-form]))
>>>
>>> (t/ann dt->hiccup [(HVec [Keyword (U Keyword (HVec [Keyword Number])) t/Any
>>> t/Any *]) ->
>>> html-form-group])
>>> (defmulti dt->hiccup (t/fn [col :- pt/et-column]
>>> (if (vector? (second col))
>>> (first (second col))
>>> (second col))))
>>>
>>> And here comes the error message when checking this function:
>>>
>>> Type Error (leiningen/td_to_hiccup.clj:25:34) Polymorphic function first
>>> could not be applied to arguments:
>>> Polymorphic Variables:
>>> x
>>>
>>> Domains:
>>> (t/HSequential [x t/Any *])
>>> (t/Option (t/EmptySeqable x))
>>> (t/NonEmptySeqable x)
>>> (t/Option (clojure.lang.Seqable x))
>>>
>>> Arguments:
>>> (t/U Keyword (t/HVec [clojure.lang.Keyword java.lang.Number]))
>>>
>>> Ranges:
>>> x :object {:path [(Nth 0)], :id 0}
>>> nil
>>> x
>>> (t/Option x)
>>>
>>> in: (first (second col))
>>> in: (first (second col))
>>>
>>>
>>> ExceptionInfo Type Checker: Found 1 error clojure.core/ex-info (core.
>>> clj:4403)
>>>
>>> My assumption is that the check (if (vector? (second col will return
>>> only true if it is this type: (HVec [Keyword Number]). However, I have
>>> the impression that core.typed does not resolve the if expression properly.
>>> Or maybe I am missing something completely.
>>>
>>> Any hints or recommendations?
>>>
>>> Thanks,
>>> Sven
>>>
>>>
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>>
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