From 851c38f64aea74947d5eb169f67d00aace8ed95c Mon Sep 17 00:00:00 2001 From: Nikolaj Bjorner Date: Fri, 24 Apr 2020 00:52:02 -0700 Subject: [PATCH] fix #4086 Signed-off-by: Nikolaj Bjorner --- src/ast/rewriter/seq_rewriter.cpp | 1 + 1 file changed, 1 insertion(+) diff --git a/src/ast/rewriter/seq_rewriter.cpp b/src/ast/rewriter/seq_rewriter.cpp index de0f5be07..ba618ab71 100644 --- a/src/ast/rewriter/seq_rewriter.cpp +++ b/src/ast/rewriter/seq_rewriter.cpp @@ -1270,6 +1270,7 @@ br_status seq_rewriter::mk_seq_index(expr* a, expr* b, expr* c, expr_ref& result expr_ref a1(m()); a1 = m_util.str.mk_concat(as.size() - i, as.c_ptr() + i, sort_a); result = m_util.str.mk_index(a1, b, m_autil.mk_int(r)); + result = m().mk_ite(m_autil.mk_ge(result, zero()), m_autil.mk_add(m_autil.mk_int(i), result), minus_one()); return BR_REWRITE2; } }