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
> <javascript:>> 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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