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These features permit you to write code to be evaluated during compilation of a program.
You can get a similar result by putting body in a separate file
and referring to that file with
require. That method is
preferable when body is large.
Common Lisp Note: At top level, this is analogous to the Common
(eval-when (compile eval) ...). Elsewhere, the
Common Lisp `#.' reader macro (but not when interpreting) is closer
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