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(proc arg1 ...), unless proc and all the following arguments are compile-time constants. (That is: They are either constant, or symbols that have a global binding and no lexical binding.) In that case, proc is applied to the arguments at compile-time, and the result replaces the
constant-foldform. If the application raises an exception, a compile-time error is reported. For example:
(constant-fold vector 'a 'b 'c)
(quote #(a b c)), assuming
vectorhas not been re-bound.
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