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-rw-r--r--contrib/interface/vtp.ml2
1 files changed, 1 insertions, 1 deletions
diff --git a/contrib/interface/vtp.ml b/contrib/interface/vtp.ml
index 551ad3a3..94609009 100644
--- a/contrib/interface/vtp.ml
+++ b/contrib/interface/vtp.ml
@@ -246,7 +246,7 @@ and fCOMMAND = function
fNODE "hint_destruct" 6
| CT_hint_extern(x1, x2, x3, x4) ->
fINT x1 ++
- fFORMULA x2 ++
+ fFORMULA_OPT x2 ++
fTACTIC_COM x3 ++
fID_LIST x4 ++
fNODE "hint_extern" 4