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 <sver...@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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