Properly print error message of eglot-alternatives

* eglot.el (eglot-alternatives): Work with the listified form. This
allows presumed executables provided as (EXECUTABLE &rest ARGS...)
to be displayed in the error.

GitHub-reference: per https://github.com/joaotavora/eglot/issues/786

diff --git a/lisp/progmodes/eglot.el b/lisp/progmodes/eglot.el
index ef9b371af893db1d4472d00b1fad3a68b2c16e16..922b9225d27157adff7007330118d116e1e5176f 100644 (file)
--- a/lisp/progmodes/eglot.el
+++ b/lisp/progmodes/eglot.el
@@ -114,7 +114,7 @@ chosen (interactively or automatically)."
                                collect (if (listp a) a (list a))))
            (err (lambda ()
                   (error "None of '%s' are valid executables"
-                         (mapconcat #'identity alternatives ", ")))))
+                         (mapconcat #'car listified ", ")))))
       (cond (interactive
              (let* ((augmented (mapcar (lambda (a)
                                          (let ((found (eglot--executable-find