yes, the problem is with `proxy` and redefinition, I'm working on a patch to 
fix this

> On 2 Aug 2018, at 07:55, Mark Engelberg <mark.engelb...@gmail.com> wrote:
> 
> For those following along at home, it turned out not to be a problem with the 
> lein-virgil plugin.  It's apparently a bug in Clojure.  Renzo and I distilled 
> it down to the following steps:
> 
> user=> (definterface Interface (test []))
> user.Interface
> user=> (def p (proxy [Object Interface] [] (test [] 1)))
> #'user/p
> user=> (defn get-test [o] (.test ^Interface o))
> #'user/get-test
> user=> (get-test p)
> 1
> user=> (definterface Interface (test []))
> user.Interface
> user=> (def p (proxy [Object Interface] [] (test [] 1)))
> #'user/p
> user=> (defn get-test [o] (.test ^Interface o))
> #'user/get-test
> user=> (get-test p)
> 
> ClassCastException user.proxy$java.lang.Object$Interface$936446c6 cannot be 
> cast to user.Interface  user/get-test (form-init7484886365563813996.clj:1)
> 
> 
> 
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