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update replace semantics

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2016-09-08 13:59:13 -07:00
parent 2d9dced1c7
commit e485d1889c
2 changed files with 11 additions and 3 deletions
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8
src/ast/rewriter/seq_rewriter.cpp
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@ -637,6 +637,14 @@ br_status seq_rewriter::mk_seq_replace(expr* a, expr* b, expr* c, expr_ref& resu
result = a;
return BR_DONE;
}
if (m_util.str.is_string(b, s1) && s2.length() == 0) {
result = m_util.str.mk_concat(a, c);
return BR_REWRITE1;
}
if (m_util.str.is_string(a, s1) && s1.length() == 0) {
result = a;
return BR_DONE;
}
return BR_FAILED;
}