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fix #6686
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@ -72,6 +72,7 @@ public:
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void set_upper_is_open(interval & a, bool v) { a.m_upper_open = v; }
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void set_lower_is_inf(interval & a, bool v) { a.m_lower_inf = v; }
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void set_upper_is_inf(interval & a, bool v) { a.m_upper_inf = v; }
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// Reference to numeral manager
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numeral_manager & m() const { return m_manager; }
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@ -184,6 +185,14 @@ public:
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bool upper_is_open(interval const & a) const { return m_c.upper_is_open(a); }
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bool lower_is_inf(interval const & a) const { return m_c.lower_is_inf(a); }
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bool upper_is_inf(interval const & a) const { return m_c.upper_is_inf(a); }
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bool is_empty(interval const& a) const {
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if (lower_is_inf(a) || upper_is_inf(a))
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return false;
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ext_numeral_kind lk = lower_kind(a), uk = upper_kind(a);
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if (lower_is_open(a) || upper_is_open(a))
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return !(::lt(m(), lower(a), lk, upper(a), uk));
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return ::lt(m(), upper(a), uk, lower(a), lk);
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}
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bool lower_is_neg(interval const & a) const { return ::is_neg(m(), lower(a), lower_kind(a)); }
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bool lower_is_pos(interval const & a) const { return ::is_pos(m(), lower(a), lower_kind(a)); }
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@ -681,7 +681,7 @@ void interval_manager<C>::set(interval & t, interval const & s) {
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}
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set_lower_is_open(t, lower_is_open(s));
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set_upper_is_open(t, upper_is_open(s));
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SASSERT(check_invariant(t));
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SASSERT(is_empty(t) || check_invariant(t));
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}
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template<typename C>
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@ -813,7 +813,7 @@ void interval_manager<C>::add(interval const & a, interval const & b, interval &
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set_upper_is_inf(c, new_u_kind == EN_PLUS_INFINITY);
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set_lower_is_open(c, lower_is_open(a) || lower_is_open(b));
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set_upper_is_open(c, upper_is_open(a) || upper_is_open(b));
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SASSERT(check_invariant(c));
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SASSERT(is_empty(a) || is_empty(b) || check_invariant(c));
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}
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template<typename C>
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