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fixes for #6577

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- the literal false should not appear in clauses
- the literal true forces a tautology
- fix early return in is_cnf check. It should check all clauses for nested Booleans.
This commit is contained in:
Nikolaj Bjorner 2023-02-11 09:32:53 -08:00
parent d22e4aa525
commit 46c8d78ece
3 changed files with 16 additions and 13 deletions
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2
src/api/api_goal.cpp
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@ -198,7 +198,7 @@ extern "C" {
RESET_ERROR_CODE();
std::ostringstream buffer;
if (!to_goal_ref(g)->is_cnf()) {
SET_ERROR_CODE(Z3_INVALID_ARG, "If this is not what you want, then preprocess by optional bit-blasting and applying tseitin-cnf");
SET_ERROR_CODE(Z3_INVALID_ARG, "Goal is not converted into CNF. Preprocess by optional bit-blasting and applying tseitin-cnf");
RETURN_Z3(nullptr);
}
to_goal_ref(g)->display_dimacs(buffer, include_names);