From ad2e6ff2b42ef1d0e8e1ea4dde1c1b752666b98b Mon Sep 17 00:00:00 2001
From: Nikolaj Bjorner <nbjorner@microsoft.com>
Date: Tue, 31 Mar 2020 12:49:48 -0700
Subject: [PATCH] fix #3607

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
---
 src/smt/smt_internalizer.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/smt/smt_internalizer.cpp b/src/smt/smt_internalizer.cpp
index 671e46440..9536c7f40 100644
--- a/src/smt/smt_internalizer.cpp
+++ b/src/smt/smt_internalizer.cpp
@@ -657,7 +657,7 @@ namespace smt {
             case OP_DISTINCT:
             case OP_IMPLIES:
             case OP_XOR:
-                UNREACHABLE();
+                throw default_exception("formula has not been simplified");
             case OP_OEQ:
                 UNREACHABLE();
             default: