From 04fec3f6a009fa8620da10ae8f7ca34bd1b4c53f Mon Sep 17 00:00:00 2001 From: Nikolaj Bjorner Date: Thu, 23 Apr 2020 21:34:20 -0700 Subject: [PATCH] fix #4076 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 8cdf0091e..2ed819355 100644 --- a/src/ast/rewriter/seq_rewriter.cpp +++ b/src/ast/rewriter/seq_rewriter.cpp @@ -1286,6 +1286,7 @@ br_status seq_rewriter::mk_seq_index(expr* a, expr* b, expr* c, expr_ref& result if (i > 0) { result = m_util.str.mk_index( m_util.str.mk_concat(as.size() - i, as.c_ptr() + i, sort_a), b, c); + result = m().mk_ite(m_autil.mk_ge(result, zero()), m_autil.mk_add(m_autil.mk_int(i), result), minus_one()); return BR_REWRITE1; }