From: Gregory Heytings Date: Sat, 18 Mar 2023 22:41:33 +0000 (+0000) Subject: Improve warning about changing the string returned by symbol-name X-Git-Tag: emacs-29.0.90~126 X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=b7f03333551b2214f4d151d25d319e62402167c1;p=emacs.git Improve warning about changing the string returned by symbol-name * src/data.c (Fsymbol_name): Add warning. See bug#62009. * doc/lispref/symbols.texi (Creating Symbols): Improve warning. --- diff --git a/doc/lispref/symbols.texi b/doc/lispref/symbols.texi index 5b53cbe310a..c6a0408abd1 100644 --- a/doc/lispref/symbols.texi +++ b/doc/lispref/symbols.texi @@ -276,9 +276,8 @@ This function returns the string that is @var{symbol}'s name. For example: @end group @end example -@strong{Warning:} Changing the string by substituting characters does -change the name of the symbol, but fails to update the obarray, so don't -do it! +@strong{Warning:} Never alter the string returned by that function. +Doing that might make Emacs dysfunctional, and might even crash Emacs. @end defun @cindex uninterned symbol, and generating Lisp code diff --git a/src/data.c b/src/data.c index 0f1d881e00b..930d476bc3f 100644 --- a/src/data.c +++ b/src/data.c @@ -773,7 +773,10 @@ DEFUN ("symbol-plist", Fsymbol_plist, Ssymbol_plist, 1, 1, 0, } DEFUN ("symbol-name", Fsymbol_name, Ssymbol_name, 1, 1, 0, - doc: /* Return SYMBOL's name, a string. */) + doc: /* Return SYMBOL's name, a string. + +Warning: never alter the string returned by `symbol-name'. +Doing that might make Emacs dysfunctional, and might even crash Emacs. */) (register Lisp_Object symbol) { register Lisp_Object name;