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
. Using require
is
preferable if there is a substantial amount of code to be executed in
this way.
At top level, this is analogous to the Common Lisp idiom
(eval-when (compile eval) ...)
. Elsewhere, the Common Lisp
`#.' reader macro (but not when interpreting) is closer to what
eval-when-compile
does.
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