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-rw-r--r--toplevel/stm.ml1
1 files changed, 1 insertions, 0 deletions
diff --git a/toplevel/stm.ml b/toplevel/stm.ml
index f63cd9e4e..85e9a30ab 100644
--- a/toplevel/stm.ml
+++ b/toplevel/stm.ml
@@ -1590,6 +1590,7 @@ type focus = {
}
let edit_at id =
+ if Stateid.equal id Stateid.dummy then anomaly(str"edit_at dummy") else
let vcs = VCS.backup () in
let on_cur_branch id =
let rec aux cur =