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-rw-r--r--src/lem_interp/interp_lib.lem2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/lem_interp/interp_lib.lem b/src/lem_interp/interp_lib.lem
index 7e573308..7e86ae7e 100644
--- a/src/lem_interp/interp_lib.lem
+++ b/src/lem_interp/interp_lib.lem
@@ -180,6 +180,8 @@ let to_num signed v =
| (V_vector idx inc l) ->
if has_unknown v
then V_unknown
+ else if l=[]
+ then V_unknown
else
(* Word library in Lem expects bitseq with LSB first *)
let l = reverse l in