JVM bytecode can't contain data-structures, only code. If you eval
something or embed it in macro output the clojure compiler needs to be
able to output code that reconstructs an equal object. There are some
types that it can't do that for.
user=> (def x)
#'user/x
user=> x
#<Unbound Unbound: #'user/x>
user=> (eval x)
#<Unbound Unbound: #'user/x>
user=> (eval [x])
CompilerException java.lang.RuntimeException: Can't embed object in
code, maybe print-dup not defined: Unbound: #'user/x,
compiling:(NO_SOURCE_PATH:1:1)
The compiler seems to be complaining that print-dup is not defined at
that the point that it is used. I *would* suspect some subtle
read-time/compile-time distinction in when vars are defined inside a
single form but I can't reproduce your problem:
user=> (binding [*foo* nil]
#_=> (def e 1)
#_=> `e)
user/e
user=> (binding [*foo* nil]
#_=> (def x 1)
#_=> x)
1
user=> (binding [*foo* nil]
#_=> (def y 1)
#_=> (eval `y))
1
user=> (binding [*foo* nil]
#_=> (def z 1)
#_=> ^{:tag `z} [])
[]
user=> (binding [*foo* nil]
#_=> (def q 1)
#_=> ^{:tag #=(eval `q)} [])
[]
user=> (binding [*foo* nil]
#_=> (defn bar [])
#_=> (bar))
nil
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