Seems to be the simplest case for this warning (run against master branch):
(when-let [x nil]
(+ x 100))
WARNING: cljs.core/+, all arguments must be numbers, got [clj-nil number]
instead. at line 4 src/example/core.cljs
On Tuesday, December 30, 2014 3:22:04 AM UTC-6, Andrew Mcveigh wrote:
> I'm also seeing this in cljs-time in both "0.0-2411" and "0.0-2511". The call
> to cljs.core// can never be reached with a nil 'millis, but the compiler
> still gives the warning.
>
> WARNING: cljs.core//, all arguments must be numbers, got [#{nil clj-nil}
> number] instead. at line 51 src/cljs_time/coerce.cljs
>
> (defn to-epoch
> "Convert `obj` to Unix epoch."
> [obj]
> (let [millis (to-long obj)]
> (and millis (/ millis 1000))))
>
> OR
>
> (defn to-epoch
> "Convert `obj` to Unix epoch."
> [obj]
> (when-let [millis (to-long obj)]
> (/ millis 1000)))
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