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change order of concatentation for empty string, #1595

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-04-26 09:08:34 +02:00
parent a04921dafe
commit 74292a48e5
1 changed files with 1 additions and 1 deletions
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2
src/ast/rewriter/seq_rewriter.cpp
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@ -856,7 +856,7 @@ br_status seq_rewriter::mk_seq_replace(expr* a, expr* b, expr* c, expr_ref& resu
return BR_DONE;
}
if (m_util.str.is_string(b, s2) && s2.length() == 0) {
result = m_util.str.mk_concat(a, c);
result = m_util.str.mk_concat(c, a);
return BR_REWRITE1;
}
if (m_util.str.is_string(a, s1) && s1.length() == 0) {