I'm working from a fork of Clojurescript, cljs-in-cljs, and have been building 
a project on top of it.  Part of the project involves attempting to use 
core.async, and I've been backporting patches and update to cljs-in-cljs on an 
as-needed basis; the cljs-in-cljs fork is a year old.

cljs.core.async.dispatch refers to and uses an 'exists?' definition that does 
not appear to exist anywhere in my tree or in core.async.  Searching through 
the github master source code for the `exists?` definition has not turned up 
anything.

Defining `exists?` as such, in core.async.dispatch seeems to make it work:

(defn exists? [obj] (not= (goog/typeOf obj) "undefined"))

However, I am wondering if it is a core language feature that I cannot seem to 
find -- if it is, I'd add it to cljs-in-cljs rather than monkeypatching 
core.async.

-Wes

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