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-rw-r--r--lisp/progmodes/prolog.el7
1 files changed, 4 insertions, 3 deletions
diff --git a/lisp/progmodes/prolog.el b/lisp/progmodes/prolog.el
index 24ca78ad4ef..5b229cc0c24 100644
--- a/lisp/progmodes/prolog.el
+++ b/lisp/progmodes/prolog.el
@@ -868,8 +868,9 @@ VERSION is of the format (Major . Minor)"
(defun prolog-find-value-by-system (alist)
"Get value from ALIST according to `prolog-system'."
(let ((system (or prolog-system
- (buffer-local-value 'prolog-system
- (prolog-inferior-buffer 'dont-run)))))
+ (let ((infbuf (prolog-inferior-buffer 'dont-run)))
+ (when infbuf
+ (buffer-local-value 'prolog-system infbuf))))))
(if (listp alist)
(let (result
id)
@@ -1522,7 +1523,7 @@ This function must be called from the source code buffer."
;; Emacs-20).
(set (make-local-variable 'compilation-parse-errors-function)
'prolog-parse-sicstus-compilation-errors))
- (toggle-read-only 0)
+ (setq buffer-read-only nil)
(insert command-string "\n"))
(save-selected-window
(pop-to-buffer buffer))