When matching map values via regular expressions with a key that does not exist in the map, {{core.match}} throws an exception. Here is an example:
{code:none}
(= 2 (match {:foo "bar"}
{:bar #"bar"} 1
:else 2))))
throws
{code:none}
java.lang.ClassCastException: clojure.lang.Keyword cannot be cast to java.lang.CharSequence
at clojure.core$re_matcher.invoke (core.clj:4460)
clojure.core$re_matches.invoke (core.clj:4497)
...
because {{re-match}} gets called with the {{:clojure.core.match/not-found}} keyword since the key was not found.
The attached patch contains a test case for the problem and offers a fix by making sure that {{re-match}} only gets called when the key was found and fails the match gently otherwise.
