Improve Tramp backward compatibility

* lisp/net/tramp-compat.el (tramp-compat-tramp-file-name-slots):
New defmacro.
* lisp/net/tramp.el (with-parsed-tramp-file-name): Use it.

2 files changed, 7 insertions, 3 deletions

diff --git a/lisp/net/tramp-compat.el b/lisp/net/tramp-compat.el
index 214ad040a17..9326f7b1864 100644
--- a/lisp/net/tramp-compat.el
+++ b/lisp/net/tramp-compat.el
@@ -235,6 +235,12 @@ If NAME is a remote file name, the local part of NAME is unquoted."
         ((eq tramp-syntax 'sep) 'separate)
         (t tramp-syntax)))
 
+;; `cl-struct-slot-info' has been introduced with Emacs 25.
+(defmacro tramp-compat-tramp-file-name-slots ()
+  (if (fboundp 'cl-struct-slot-info)
+      `(cdr (mapcar 'car (cl-struct-slot-info 'tramp-file-name)))
+    `(cdr (mapcar 'car (get 'tramp-file-name 'cl-struct-slots)))))
+
 (provide 'tramp-compat)
 
 ;;; TODO:
diff --git a/lisp/net/tramp.el b/lisp/net/tramp.el
index 3d6934783f5..5a59dd622dd 100644
--- a/lisp/net/tramp.el
+++ b/lisp/net/tramp.el
@@ -1760,9 +1760,7 @@ If VAR is nil, then we bind `v' to the structure and `method', `user',
                    `(,(if var (intern (format "%s-%s" var elem)) elem)
                      (,(intern (format "tramp-file-name-%s" elem))
                       ,(or var 'v))))
-                 (eval-and-compile
-                   (cdr
-                    (mapcar 'car (cl-struct-slot-info 'tramp-file-name)))))))
+                 `,(tramp-compat-tramp-file-name-slots))))
     `(let* ((,(or var 'v) (tramp-dissect-file-name ,filename))
             ,@bindings)
        ;; We don't know which of those vars will be used, so we bind them all,