I think it's finding the problems through the multiple merged map paths but 
would be reasonable to de-dupe these if they're identical. Feel free to 
file a jira for it.

On Saturday, September 1, 2018 at 10:19:49 AM UTC-5, Lucas Groenendaal 
wrote:
>
> Just started learning about spec and am going through the guide: 
> https://clojure.org/guides/spec (so I'm using clojure 1.9.0 and have 
> required clojure.spec.alpha).
>
> They introduced the merge macro with this example:
> (s/def :animal/kind string?)
> (s/def :animal/says string?)
> (s/def :animal/common (s/keys :req [:animal/kind :animal/says]))
> (s/def :dog/tail? boolean?)
> (s/def :dog/breed string?)
> (s/def :animal/dog (s/merge :animal/common
>                             (s/keys :req [:dog/tail? :dog/breed])))
>
> But when I call explain on a data structure that does not conform to these 
> specs (:dog/breed is not a string in this example), it outputs duplicate 
> information about the failure. Is this a bug?
>
> (s/explain :animal/dog {:animal/kind "dog" :animal/says "woof" :dog/tail? 
> true :dog/breed 1})
>
> In: [:dog/breed] val: 1 fails spec: :dog/breed at: [:dog/breed] predicate: 
> string?
> In: [:dog/breed] val: 1 fails spec: :dog/breed at: [:dog/breed] predicate: 
> string?
>
> Thanks for any and all help!
> Lucas
>

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