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produces a copy of its own source code

In computing, a quine is a computer program which produces a copy of its own source code as its only output.
DiskEdit
python
# adapted from a Quine by Sean B. Palmer

print (lambda s='print (lambda s=%r: (s %% s))()': (s % s))()
DiskEdit
python
x='x=%r;print(x%%x)';print(x%x)
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clojure
(def s"(def s%s)(printf s(pr-str s))")(printf s(pr-str s))

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