master b7d4c5d: help-follow-symbol now complains if no symbol found (bug#38248)

[Juanma Barranquero]

branch: master
commit b7d4c5d1d1b55fea8382663f18263e2000678be5
Author: Juanma Barranquero <address@hidden>
Commit: Juanma Barranquero <address@hidden>

    help-follow-symbol now complains if no symbol found (bug#38248)
    
    * lisp/help-mode.el (help-follow-symbol): Signal 'user-error' if
    there's no symbol at POS.
    
    * etc/NEWS: Document it.
---
 etc/NEWS          | 4 ++++
 lisp/help-mode.el | 9 +++++----
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/etc/NEWS b/etc/NEWS
index b92fdeb..ad349b1 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -2588,6 +2588,10 @@ pointer is over.  To change this behaviour, you can 
customize the user
 option 'mouse-wheel-follow-mouse'.  Note that this will also affect
 scrolling.
 
+---
+** help-follow-symbol now signals 'user-error' if point (or the
+position pointed to by the argument POS) is not in a symbol.
+
 
 * Lisp Changes in Emacs 27.1
 
diff --git a/lisp/help-mode.el b/lisp/help-mode.el
index 054a1ef..e70570c 100644
--- a/lisp/help-mode.el
+++ b/lisp/help-mode.el
@@ -749,10 +749,11 @@ Show all docs for that symbol as either a variable, 
function or face."
            (buffer-substring (point)
                              (progn (skip-syntax-forward "w_")
                                     (point)))))))
-    (when (or (boundp sym)
-             (get sym 'variable-documentation)
-             (fboundp sym) (facep sym))
-      (help-do-xref pos #'describe-symbol (list sym)))))
+    (if (or (boundp sym)
+           (get sym 'variable-documentation)
+           (fboundp sym) (facep sym))
+        (help-do-xref pos #'describe-symbol (list sym))
+      (user-error "No symbol here"))))
 
 (defun help-mode-revert-buffer (_ignore-auto noconfirm)
   (when (or noconfirm (yes-or-no-p "Revert help buffer? "))