Re: Elisp string function question

[Robert Pluim <rpluim@gmail.com>]

>>>>> On Fri, 18 Jun 2021 16:48:18 +0300, Eli Zaretskii <eliz@gnu.org> said:

    >> From: Robert Pluim <rpluim@gmail.com>
    >> Cc: help-gnu-emacs@gnu.org
    >> Gmane-Reply-To-List: yes
    >> Date: Fri, 18 Jun 2021 15:32:19 +0200
    >> 
    Eli> Not clear.  string-empty-p follows the examples of string=, which
    Eli> allows symbols as arguments (and uses their name).
    >> 
    >> Then itʼs buggy:
    >> 
    >> (let ((s (make-symbol "")))
    >> (string-empty-p s))
    >> => t

    Eli> Is it?  What is the name of the symbol created there?

The name is "", but the symbol itself has no value, so string-empty-p
should not say t

(let ((s (make-symbol "")))
  (message s))
=>
Debugger entered--Lisp error: (wrong-type-argument stringp ##)
  message(##)
  (let ((s (make-symbol ""))) (message s))
  (progn (let ((s (make-symbol ""))) (message s)))
  eval((progn (let ((s (make-symbol ""))) (message s))) t)

Compare this with:

(let ((s ""))
  (string-empty-p s) => t
  (message "string '%s'" s)) => no complaints from 'message'
  
If youʼre saying this is expected, then it should *definitely* be
documented, because for me the argument to 'string-empty-p' should be
a string.

Robert
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