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-rw-r--r--src/lem_interp/interp_lib.lem3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/lem_interp/interp_lib.lem b/src/lem_interp/interp_lib.lem
index d83341c8..bcacaabc 100644
--- a/src/lem_interp/interp_lib.lem
+++ b/src/lem_interp/interp_lib.lem
@@ -145,7 +145,8 @@ let bitwise_not_bit v =
| L_zero -> (V_lit (L_aux L_one loc))
| L_false -> (V_lit (L_aux L_one loc))
| L_one -> (V_lit (L_aux L_zero loc))
- | L_true -> (V_lit (L_aux L_zero loc)) end in
+ | L_true -> (V_lit (L_aux L_zero loc))
+ | L_undef -> (V_lit (L_aux L_undef loc)) end in
retaint v (match detaint v with
| V_lit lit -> lit_not lit
| V_unknown -> V_unknown end)