* doc/lispref/strings.texi (Creating Strings): 'concat' does not necessarily return a newly allocated string. This has been the case at least since 1997 (Emacs 20.3).
* doc/lispref/strings.texi (Creating Strings): 'concat' does not necessarily return a newly allocated string. This has been the case at least since 1997 (Emacs 20.3).