Oh, you changed it to (t/HVec [Keyword (t/I Keyword (t/HVec [Keyword
Number])) t/Any t/Any *])?
Unions are like `or`, intersections like `and`. This might work for
checking the definition, as function bodies are
checked with a set of assumptions about parameter types.
However it should be impossible to call this function as you cannot
construct a type of (I Keyword (HVec ...)).
Thanks,
Ambrose
On Thu, Apr 16, 2015 at 5:07 PM, Ambrose Bonnaire-Sergeant <
abonnaireserge...@gmail.com> wrote:
> 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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