I've managed to get an NPE in print-stack-trace: 
https://gist.github.com/si14/e8d22913d21933d12ef1

It seems highly counter-intuitive to me that this function can throw NPEs. 
I thought it's intended to be used in "catch" clauses; does it mean that I 
should wrap some catches in their own try-catches?

Anderkent in #clojure suggested that the cause of this NPE is an exception 
without stacktrace, similar to ones discussed here: 
http://jawspeak.com/2010/05/26/hotspot-caused-exceptions-to-lose-their-stack-traces-in-production-and-the-fix/
 If 
this is the case, the situation is even worse, because it's hard to foresee 
this optimization.

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