* lisp/emacs-lisp/shortdoc.el: More and better `substring` examples.

Suggested by Juri Linkov.

1 files changed, 4 insertions, 2 deletions

diff --git a/lisp/emacs-lisp/shortdoc.el b/lisp/emacs-lisp/shortdoc.el
index c49960c2ee6..871233097a7 100644
--- a/lisp/emacs-lisp/shortdoc.el
+++ b/lisp/emacs-lisp/shortdoc.el
@@ -187,8 +187,10 @@ A FUNC form can have any number of `:no-eval' (or `:no-value'),
    :eval (format "This number is %d" 4))
   "Manipulating Strings"
   (substring
-   :eval (substring "foobar" 0 3)
-   :eval (substring "foobar" 3))
+   :eval (substring "abcde" 1 3)
+   :eval (substring "abcde" 2)
+   :eval (substring "abcde" 1 -1)
+   :eval (substring "abcde" -4 4))
   (string-limit
    :eval (string-limit "foobar" 3)
    :eval (string-limit "foobar" 3 t)