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Fix bug reported by Philippe Suter, see RELEASE_NOTES
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
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@ -30,6 +30,21 @@ Version 4.3.2
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- Fixed problem in the pretty printer. It was not introducing quotes for attribute names such as |foo:10|.
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- Fixed bug when using assumptions (Thanks to Philippe Suter)
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Consider the following example:
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(assert F)
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(check-sat a)
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(check-sat)
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If 'F' is unstatisfiable independently of the assumption 'a', and
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the inconsistenty can be detected by just performing propagation,
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Then, version <= 4.3.1 may return
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unsat
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sat
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instead of
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unsat
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unsat
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We say may because 'F' may have other unsatisfiable cores.
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Version 4.3.1
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=============
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@ -2854,7 +2854,12 @@ namespace smt {
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m_bool_var2assumption.reset();
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m_unsat_core.reset();
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if (num_assumptions > 0) {
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propagate(); // we must give a chance to the theories to propagate before we create a new scope...
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// We must give a chance to the theories to propagate before we create a new scope...
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propagate();
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// Internal backtracking scopes (created with push_scope()) must only be created when we are
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// in a consistent context.
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if (inconsistent())
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return;
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push_scope();
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for (unsigned i = 0; i < num_assumptions; i++) {
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expr * curr_assumption = assumptions[i];
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@ -3987,3 +3992,8 @@ namespace smt {
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};
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#ifdef Z3DEBUG
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void pp(smt::context & c) {
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c.display(std::cout);
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}
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#endif
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