diff --git a/src/smt/old_interval.cpp b/src/smt/old_interval.cpp
index 48fd7d69a..c0e52c17b 100644
--- a/src/smt/old_interval.cpp
+++ b/src/smt/old_interval.cpp
@@ -227,16 +227,6 @@ interval::interval(v_dependency_manager & m, rational const & val, bool open, bo
     }
 }
 
-interval::interval(interval const & other):
-    m_manager(other.m_manager),
-    m_lower(other.m_lower),
-    m_upper(other.m_upper),
-    m_lower_open(other.m_lower_open),
-    m_upper_open(other.m_upper_open),
-    m_lower_dep(other.m_lower_dep),
-    m_upper_dep(other.m_upper_dep) {
-}
-
 interval & interval::operator=(interval const & other) {
     m_lower = other.m_lower;
     m_upper = other.m_upper;
diff --git a/src/smt/old_interval.h b/src/smt/old_interval.h
index a666908e4..8919d9ca0 100644
--- a/src/smt/old_interval.h
+++ b/src/smt/old_interval.h
@@ -27,14 +27,12 @@ public:
     enum kind { MINUS_INFINITY, FINITE, PLUS_INFINITY };
 private:
     kind     m_kind;
-    rational m_value; 
-    explicit ext_numeral(kind k):m_kind(k) {}
+    rational m_value;
 public:
     ext_numeral():m_kind(FINITE) {} /* zero */
     explicit ext_numeral(bool plus_infinity):m_kind(plus_infinity ? PLUS_INFINITY : MINUS_INFINITY) {}
     explicit ext_numeral(rational const & val):m_kind(FINITE), m_value(val) {}
     explicit ext_numeral(int i):m_kind(FINITE), m_value(i) {}
-    ext_numeral(ext_numeral const & other):m_kind(other.m_kind), m_value(other.m_value) {}
     bool is_infinite() const { return m_kind != FINITE; }
     bool sign() const { return m_kind == MINUS_INFINITY || (m_kind == FINITE && m_value.is_neg()); }
     void neg();
@@ -78,13 +76,12 @@ class old_interval {
     v_dependency * join_opt(v_dependency * d1, v_dependency * d2, v_dependency * opt1, v_dependency * opt2);
 
 public:
-    explicit old_interval(v_dependency_manager & m);  
+    explicit old_interval(v_dependency_manager & m);
     explicit old_interval(v_dependency_manager & m, rational const & lower, bool l_open, v_dependency * l_dep, rational const & upper, bool u_open, v_dependency * u_dep);
     explicit old_interval(v_dependency_manager & m, rational const & val, v_dependency * l_dep = nullptr, v_dependency * u_dep = nullptr);
     explicit old_interval(v_dependency_manager & m, rational const & val, bool open, bool lower, v_dependency * d);
     explicit old_interval(v_dependency_manager & m, ext_numeral const& lower, bool l_open, v_dependency * l_dep, ext_numeral const & upper, bool u_open, v_dependency * u_dep);
-    old_interval(old_interval const & other);
-    
+
     bool minus_infinity() const { return m_lower.is_infinite(); }
     bool plus_infinity() const { return m_upper.is_infinite(); }
     bool is_lower_open() const { return m_lower_open; }
diff --git a/src/util/buffer.h b/src/util/buffer.h
index aec826a55..57150a124 100644
--- a/src/util/buffer.h
+++ b/src/util/buffer.h
@@ -43,6 +43,9 @@ protected:
         T * new_buffer        = reinterpret_cast<T*>(memory::allocate(sizeof(T) * new_capacity));
         for (unsigned i = 0; i < m_pos; ++i) {
             new (&new_buffer[i]) T(std::move(m_buffer[i]));
+            if (CallDestructors) {
+                m_buffer[i].~T();
+            }
         }
         free_memory();
         m_buffer              = new_buffer;