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fix #4982

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2021-01-29 06:43:33 -08:00
parent 5c9b205dfc
commit b402268d35
3 changed files with 21 additions and 0 deletions
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6
src/ast/rewriter/seq_rewriter.cpp
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@ -1383,6 +1383,12 @@ br_status seq_rewriter::mk_seq_nth_i(expr* a, expr* b, expr_ref& result) {
}
unsigned len = r.get_unsigned();
expr* a2, *i2;
if (len == 0 && str().is_at(a, a2, i2) && m_autil.is_numeral(i2, r) && r.is_zero()) {
result = str().mk_nth_i(a2, i2);
return BR_REWRITE1;
}
expr_ref_vector as(m());
str().get_concat_units(a, as);