In Clojure v1.6.0. This one confused me when I'd accidentally passed a list 
in to `update-in` instead of a vector:

~~~
some-app.core=> (update-in [:a :b :c] [1] name)
[:a "b" :c]
some-app.core=> (update-in '(:a :b :c) [1] name)

NullPointerException   clojure.core/name (core.clj:1518)
~~~

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