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fix #7446, by adding rewrite simplification
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
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@ -2467,6 +2467,10 @@ br_status seq_rewriter::mk_str_le(expr* a, expr* b, expr_ref& result) {
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br_status seq_rewriter::mk_str_lt(expr* a, expr* b, expr_ref& result) {
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zstring as, bs;
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if (str().is_empty(b)) {
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result = m().mk_false();
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return BR_DONE;
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}
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if (str().is_string(a, as) && str().is_string(b, bs)) {
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unsigned sz = std::min(as.length(), bs.length());
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for (unsigned i = 0; i < sz; ++i) {
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