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-rw-r--r--lisp/progmodes/tcl.el3
1 files changed, 2 insertions, 1 deletions
diff --git a/lisp/progmodes/tcl.el b/lisp/progmodes/tcl.el
index 8f7705ba17d..e4e96554c95 100644
--- a/lisp/progmodes/tcl.el
+++ b/lisp/progmodes/tcl.el
@@ -1028,7 +1028,8 @@ Returns nil if line starts inside a string, t if in a comment."
(with-current-buffer (process-buffer proc)
;; Delete prompt if requested.
(when (marker-buffer inferior-tcl-delete-prompt-marker)
- (delete-region (process-mark proc) inferior-tcl-delete-prompt-marker)
+ (let ((inhibit-read-only t))
+ (delete-region (process-mark proc) inferior-tcl-delete-prompt-marker))
(set-marker inferior-tcl-delete-prompt-marker nil))))
(comint-output-filter proc string))