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Make 'mapconcat' argument 'separator' optional

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* src/fns.c (Fmapconcat): Make third 'separator' argument
optional.  (Bug#50965)
* doc/lispref/functions.texi (Mapping Functions): Update
documentation for above change.
* test/src/fns-tests.el (fns-tests-mapconcat): New test.

* doc/misc/cl.texi (Obsolete Setf Customization): Don't use third
mapconcat argument in example.
* lisp/emacs-lisp/subr-x.el (string-join): Doc fix.
This commit is contained in:
Stefan Kangas 2021-10-05 15:36:31 +02:00
parent 4bf532ee82
commit d652efcd08
6 changed files with 35 additions and 9 deletions
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4
lisp/emacs-lisp/subr-x.el
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@ -208,7 +208,9 @@ The variable list SPEC is the same as in `if-let'."
(string= string ""))
(defsubst string-join (strings &optional separator)
"Join all STRINGS using SEPARATOR."
"Join all STRINGS using SEPARATOR.
Optional argument SEPARATOR must be a string, a vector, or a list of
characters; nil stands for the empty string."
(mapconcat #'identity strings separator))
(define-obsolete-function-alias 'string-reverse 'reverse "25.1")