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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