What does eval'ing a form containing an object reference cause an 
exception?  What am I doing wrong?

user=> (eval [(java.util.Date.)])
java.lang.RuntimeException: Can't embed object in code, maybe print-dup not 
defined: Fri Mar 11 19:33:04 EST 2011 (NO_SOURCE_FILE:153)

This is the simplest example could contrive, but in the real code, I'm 
trying to rename a bunch of files.  I have two sequences of File objects; I 
build up a list of commands in a do block, then try to eval it.  I am using 
eval because I want to inspect the whole form at the REPL before evaluating 
it.

user=> (eval [1])
[1]
user=> (eval (java.util.Date.))
#<Date Fri Mar 11 19:31:33 EST 2011>

user=> (doc print-dup)
-------------------------
clojure.core/print-dup
nil
  nil
nil

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