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patch seq theory using purification to avoid unsoundness caused by interaction with canonization and rewriting

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2021-02-14 17:40:41 -08:00
parent 2db2767e7a
commit 70b4822571
6 changed files with 45 additions and 42 deletions
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src/smt/theory_seq.h
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@ -20,6 +20,7 @@ Revision History:
#include "ast/seq_decl_plugin.h"
#include "ast/rewriter/th_rewriter.h"
#include "ast/rewriter/seq_skolem.h"
#include "ast/ast_trail.h"
#include "util/scoped_vector.h"
#include "util/scoped_ptr_vector.h"
@ -29,7 +30,6 @@ Revision History:
#include "smt/smt_theory.h"
#include "smt/smt_arith_value.h"
#include "smt/theory_seq_empty.h"
#include "ast/rewriter/seq_skolem.h"
#include "smt/seq_axioms.h"
#include "smt/seq_regex.h"
#include "smt/seq_offset_eq.h"
@ -496,6 +496,7 @@ namespace smt {
bool reduce_ne(unsigned idx);
bool branch_nqs();
lbool branch_nq(ne const& n);
expr_ref purify(expr* e);
struct cell {
cell* m_parent;