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Fix Issue #405: Horn normal form ignores implication

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2016-01-10 19:16:59 -08:00
parent fce286db91
commit 082dcda7f7
3 changed files with 15 additions and 2 deletions
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4
src/muz/base/dl_rule.cpp
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@ -282,6 +282,8 @@ namespace datalog {
func_decl* rule_manager::mk_query(expr* query, rule_set& rules) {
TRACE("dl", tout << mk_pp(query, m) << "\n";);
ptr_vector<sort> vars;
svector<symbol> names;
app_ref_vector body(m);
@ -290,6 +292,7 @@ namespace datalog {
// Add implicit variables.
// Remove existential prefix.
bind_variables(query, false, q);
quantifier_hoister qh(m);
qh.pull_quantifier(false, q, 0, &names);
// retrieve free variables.
@ -358,6 +361,7 @@ namespace datalog {
if (!vars.empty()) {
rule_expr = m.mk_forall(vars.size(), vars.c_ptr(), names.c_ptr(), impl);
}
TRACE("dl", tout << rule_expr << "\n";);
scoped_proof_mode _sc(m, m_ctx.generate_proof_trace()?PGM_FINE:PGM_DISABLED);
proof_ref pr(m);