GNU bug report logs - #49647
27.2; Reference Manual sec. 10.2.4; Incorrect example for indirect-function

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From: Scott Marks <scott.c.marks <at> gmail.com>
To: 49647 <at> debbugs.gnu.org
Subject: bug#49647: 27.2; Reference Manual sec. 10.2.4; Incorrect example for indirect-function
Date: Mon, 19 Jul 2021 14:38:34 -0400

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If one copies the example:


Here is how you could define indirect-function in Lisp:


(defun indirect-function (function)

  (if (symbolp function)

      (indirect-function (symbol-function function))

    function))


this code will throw due to infinite recursion when invoked as


(indirect-function nil)


The fix is obvious: wrap (symbolp function) with (and function ...)


I don't think this would distract from the point of the example.


Hope this helps

Scott


In GNU Emacs 27.2 (build 1, x86_64-apple-darwin18.7.0, NS appkit-1671.60
Version 10.14.6 (Build 18G95))

 of 2021-03-27 built on builder10-14.porkrind.org

Windowing system distributor 'Apple', version 10.3.2022

System Description:  macOS 11.4


Recent messages:

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Mark set

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<nil> <down-mouse-1> is undefined

<nil> <mouse-1> is undefined

kill-region: Text is read-only: #<buffer *ielm*> [2 times]

<nil> <down-mouse-1> is undefined

<nil> <mouse-1> is undefined

Quit [4 times]

Configured using:

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