Robert Smith avatar Robert Smith committed d37640c

Add a note about correctness of DEFUNCTION.

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   `(unless ,place
      (setf ,place ,value)))
+;;; Note: This implementation isn't perfect, because it allows
+;;; non-toplevel mutations. Ideally it'd act just like DEFUN. We can
+;;; do this in SBCL using internals:
+;;; (sb-impl::%defun 'f (lambda (x) (* x x)))
+;;; or so. But we won't rely on internal APIs.
 (defmacro defunction (symbol function)
   "Define a function (bound to SYMBOL) based off of a function value
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