; Improve diagnostics in Image Dired

* lisp/image/image-dired-external.el
(image-dired--check-executable-exists): Improve diagnostics.

(cherry picked from commit 4303e5c9fa37368b50677f21aba977758f100e3c)

diff --git a/lisp/image/image-dired-external.el b/lisp/image/image-dired-external.el
index da272c146c9afdcda3cd075fa3cc30a44e676c5a..5a9fc504370901ccd0a44fdac3a9c3c91936bab1 100644 (file)
--- a/lisp/image/image-dired-external.el
+++ b/lisp/image/image-dired-external.el
@@ -240,7 +240,8 @@ function, consider that function to be an alternative to running EXECUTABLE."
     (or (and (executable-find cmd)
              (image-dired--probe-thumbnail-cmd cmd))
         (and func (fboundp func) 'function)
-        (error "Executable %S not found or not pertinent" executable))))
+        (error "Executable named by `%S' (%s) not found or not pertinent"
+               executable (symbol-value executable)))))
 
 \f
 ;;; Creating thumbnails