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-rw-r--r--isar/isar.el1
1 files changed, 1 insertions, 0 deletions
diff --git a/isar/isar.el b/isar/isar.el
index 7aedbe07..b27a12a4 100644
--- a/isar/isar.el
+++ b/isar/isar.el
@@ -89,6 +89,7 @@ See -k option for Isabelle interface script."
(defun isar-mode-config-set-variables ()
"Configure generic proof scripting mode variables for Isabelle/Isar."
+ (set (make-local-variable 'indent-tabs-mode) nil)
(setq
proof-assistant-home-page isar-web-page
proof-guess-command-line 'isabelle-set-prog-name