```clojure (t/concur #:tick{:beginning #time/instant"2000-01-01T01:00:01.011Z", :end #time/instant"2000-01-01T02:00:01.011Z"} #:tick{:beginning #time/instant"2000-01-01T00:00:00.003Z", :end #time/instant"2000-01-01T01:00:00.003Z"} #:tick{:beginning #time/instant"2000-01-01T01:00:01.179Z", :end #time/instant"2000-01-01T02:00:01.179Z"}) ``` Fails with: ```No implementation of method: :< of protocol: #'tick.core/ITimeComparison found for class: nil``` Because: ```tick.interval/relation``` cannot handle `nil`, which it will get in the example above. I worked around it by doing: ```clojure (defn safe-concur ([] nil) ([x] x) ([x & args] (reduce (fn safe-concur-check [x y] (and (and x y) (tick.interval/concur x y))) x args))) ```
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[-]`t/concur` fails[/-][+]```t/concur``` fails[/+][-]```t/concur``` fails[/-][+]t/concur fails[/+]