"Arities must be distinct" error when using direct linking in Clojure 1.8

[camsaul]

I'm seeing an "Arities must be distinct" RuntimeException when running lein uberjar with direct linking (-Dclojure.compiler.direct-linking=true) enabled.

Caused by: java.lang.RuntimeException: Arities must be distinct
    at schema.core$make_fn_schema.invokeStatic(core.clj:1049)
    at metabase.driver.query_processor.expand$fn__20187.invokeStatic(expand.clj:101)
    ...

It's being triggered by a 2-arity s/defn function that looks like this:

(s/defn ^:ql ^:always-validate datetime-field :- FieldPlaceholder
  ([f _ unit] (datetime-field f unit))
  ([f unit]   (assoc (field f) :datetime-unit (normalize-token unit))))

[w01fe]

Thanks for the report. I don't see why it shouldn't work. I have no experience with direct linking and can't reproduce with this example, so if you could provide a test project that exhibits the error (or dig in further yourself) that would be a big help. Thanks again!

[w01fe]

I looked into it and the issue seems to be that there are two copies of the
schema.core.One class floating around in this AOT compilation setting.

This causes the (instance? One ...) check in arity- to return false on
both arities (when it should return true on both), which causes the
assertion failure.

I've never used AOT myself so I'm not sure where to go from here, however.

On Tue, Feb 16, 2016 at 3:43 AM, Cam Saül [email protected] wrote:

Hey @w01fe https://github.com/w01fe if you take a look at
https://github.com/camsaul/metabase/blob/master/project.clj and run lein
uberjar you'll get the error

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