From 1f4bfcb4e5a6dee0e4e5df70f288c6b9a44fd3a1 Mon Sep 17 00:00:00 2001
From: Murphy Berzish <murphy.berzish@gmail.com>
Date: Mon, 19 Mar 2018 18:10:06 -0400
Subject: [PATCH] fix indexof subterm

---
 src/smt/theory_str.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/smt/theory_str.cpp b/src/smt/theory_str.cpp
index 534acf785..16fd28d79 100644
--- a/src/smt/theory_str.cpp
+++ b/src/smt/theory_str.cpp
@@ -1392,7 +1392,8 @@ namespace smt {
         // case 4: 0 < i < len(H)
         {
             expr_ref premise1(m_autil.mk_gt(i, zero), m);
-            expr_ref premise2(m_autil.mk_lt(i, mk_strlen(H)), m);
+            //expr_ref premise2(m_autil.mk_lt(i, mk_strlen(H)), m);
+            expr_ref premise2(m.mk_not(m_autil.mk_ge(m_autil.mk_add(i, m_autil.mk_mul(minus_one, mk_strlen(H))), zero)), m);
             expr_ref _premise(m.mk_and(premise1, premise2), m);
             expr_ref premise(_premise);
             th_rewriter rw(m);