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-rw-r--r--Source/Provers/Isabelle/Prover.cs2
1 files changed, 1 insertions, 1 deletions
diff --git a/Source/Provers/Isabelle/Prover.cs b/Source/Provers/Isabelle/Prover.cs
index 696095eb..3544458e 100644
--- a/Source/Provers/Isabelle/Prover.cs
+++ b/Source/Provers/Isabelle/Prover.cs
@@ -936,7 +936,7 @@ namespace Microsoft.Boogie.Isabelle {
public bool VisitBvConcatOp(VCExprNAry node, B2I b2i) {
//Contract.Requires(node != null);
//Contract.Requires(b2i != null);
- Contract.Requires(node.Length >= 2);
+ //Contract.Requires(node.Length >= 2);
VCExpr child1 = node[0];
Contract.Assert(child1 != null);