I'm having trouble spec'ing out something like this, a function that takes
an integer as an input followed by a series of optional keyworded args.
:even is an allowed optional keyword, but we definitely want to forbid :odd
as an optional keyword.
(s/def ::even even?)
(s/def ::options
(s/and
(s/keys* :opt-un [::even])
(fn [m] (not (contains? m :odd)))))
(defn f [n & {:as options}] nil)
(s/fdef f :args (s/cat :integer int? :options ::options))
(stest/instrument `f)
This doesn't work at all and gives all sorts of errors when f is called
with any input. I believe it is because the use of s/and in the definition
of ::options interferes with the ability of ::options to be "flattened"
into the s/cat definition.
My reasoning:
::options correctly validates [:even 2] and rejects [:even 2 :odd 3] and
[:even 3].
If I omit the s/and and the second clause so that it reads:
(s/def ::options (s/keys* :opt-un [::even]))
this also behaves as expected.
So my conclusion is that the s/and is interfering with the ability of
s/keys* to sit within the s/cat definition.
How does one solve this problem?
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