From d718da758b27c2824d2aff44faf71971133217ab Mon Sep 17 00:00:00 2001
From: Haniel Barbosa <hanielbbarbosa@gmail.com>
Date: Tue, 18 Sep 2018 08:07:21 -0500
Subject: [PATCH] fix assertion error (#2487)

---
 src/smt/model_core_builder.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/smt/model_core_builder.cpp b/src/smt/model_core_builder.cpp
index dbc6c5c9e..1cbc18c1a 100644
--- a/src/smt/model_core_builder.cpp
+++ b/src/smt/model_core_builder.cpp
@@ -40,7 +40,7 @@ bool ModelCoreBuilder::setModelCore(const std::vector<Expr>& assertions,
   }
   NodeManager* nm = NodeManager::currentNM();
 
-  Node formula = nm->mkNode(AND, asserts);
+  Node formula = asserts.size() > 1? nm->mkNode(AND, asserts) : asserts[0];
   std::vector<Node> vars;
   std::vector<Node> subs;
   Trace("model-core") << "Assignments: " << std::endl;
-- 
2.30.2