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add simplification for equalities between itos and constant strings, Issue #589

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2016-07-08 11:50:39 -07:00
parent bdbf1c9bf4
commit d5ee7e24bc
4 changed files with 60 additions and 11 deletions
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1
src/ast/seq_decl_plugin.h
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@ -250,7 +250,6 @@ public:
}
bool is_string(expr const* n, zstring& s) const;
bool is_char(expr* n, zstring& s) const;
bool is_empty(expr const* n) const { symbol s;
return is_app_of(n, m_fid, OP_SEQ_EMPTY) || (is_string(n, s) && !s.is_numerical() && *s.bare_str() == 0);