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fix #4060

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-04-22 17:46:16 -07:00
parent 886f4cbee0
commit c7878e384c
1 changed files with 1 additions and 1 deletions
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2
src/ast/rewriter/seq_rewriter.cpp
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@ -1262,7 +1262,7 @@ br_status seq_rewriter::mk_seq_index(expr* a, expr* b, expr* c, expr_ref& result
unsigned i = 0;
if (m_autil.is_numeral(c, r)) {
i = 0;
while (r.is_pos() && m_util.str.is_unit(as.get(i))) {
while (r.is_pos() && i < as.size() && m_util.str.is_unit(as.get(i))) {
r -= rational(1);
++i;
}