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I have tried (symbol-name x), but it doesn't work if the argument is a lambda:

  • ok:

#'execute-extended-command

  • not ok:
#'(lambda (&optional frame) (interactive) (message "hi 8"))
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  • 2
    That's why a lambda definition is called an "anonymous" function, What are you really trying to do? – NickD May 18 '20 at 12:46
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I don't know why you need this, but one way is:

(format "%s" #'(lambda () (interactive)))

"(closure (t) nil (interactive))"

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