diff --git a/test/has_nothrow_constr_test.cpp b/test/has_nothrow_constr_test.cpp
index 0cc5cb7..f2d60e3 100644
--- a/test/has_nothrow_constr_test.cpp
+++ b/test/has_nothrow_constr_test.cpp
@@ -37,15 +37,6 @@ struct deleted_default_construct
 
 #endif
 
-struct private_default_construct
-{
-private:
-   private_default_construct();
-public:
-   private_default_construct(char val) : member(val) {}
-   char member;
-};
-
 #ifndef BOOST_NO_CXX11_NOEXCEPT
 struct noexcept_default_construct
 {
@@ -210,7 +201,6 @@ BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_nothrow_constructor<bug11324_derived>::v
 #ifndef BOOST_NO_CXX11_DELETED_FUNCTIONS
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_nothrow_constructor<deleted_default_construct>::value, false);
 #endif
-BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_nothrow_constructor<private_default_construct>::value, false);
 #ifndef BOOST_NO_CXX11_NOEXCEPT
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_nothrow_constructor<noexcept_default_construct>::value, true);
 #endif
diff --git a/test/has_nothrow_copy_test.cpp b/test/has_nothrow_copy_test.cpp
index 034cb65..aa2ca02 100644
--- a/test/has_nothrow_copy_test.cpp
+++ b/test/has_nothrow_copy_test.cpp
@@ -12,13 +12,6 @@
 #  include <boost/type_traits/has_nothrow_copy.hpp>
 #endif
 
-struct non_copy
-{
-   non_copy();
-private:
-   non_copy(const non_copy&);
-};
-
 #ifndef BOOST_NO_CXX11_DELETED_FUNCTIONS
 
 struct delete_copy
@@ -237,10 +230,6 @@ BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_nothrow_copy<delete_copy>::value, false)
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_nothrow_copy<noexcept_copy>::value, true);
 #endif
 
-#if !defined(BOOST_NO_CXX11_DECLTYPE) && !BOOST_WORKAROUND(BOOST_MSVC, < 1800)
-BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_nothrow_copy<non_copy>::value, false);
-#endif
-
 TT_TEST_END
 
 
diff --git a/test/has_trivial_assign_test.cpp b/test/has_trivial_assign_test.cpp
index c5e40a3..50aced7 100644
--- a/test/has_trivial_assign_test.cpp
+++ b/test/has_trivial_assign_test.cpp
@@ -12,13 +12,6 @@
 #  include <boost/type_traits/has_trivial_assign.hpp>
 #endif
 
-struct non_assignable
-{
-   non_assignable();
-private:
-   non_assignable& operator=(const non_assignable&);
-};
-
 #ifndef BOOST_NO_CXX11_DELETED_FUNCTIONS
 
 struct non_assignable2
@@ -224,7 +217,6 @@ BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_trivial_assign<test_abc1>::value, false)
 #ifndef BOOST_NO_CXX11_DELETED_FUNCTIONS
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_trivial_assign<non_assignable2>::value, false);
 #endif
-BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_trivial_assign<non_assignable>::value, false);
 
 TT_TEST_END
 
diff --git a/test/has_trivial_constr_test.cpp b/test/has_trivial_constr_test.cpp
index 16a4e8a..4b89df3 100644
--- a/test/has_trivial_constr_test.cpp
+++ b/test/has_trivial_constr_test.cpp
@@ -27,13 +27,6 @@ public:
    explicit bug11324_derived(char arg) : data(arg) {}
 };
 
-struct private_construct
-{
-   private_construct(int);
-private:
-   private_construct();
-};
-
 #ifndef BOOST_NO_CXX11_DELETED_FUNCTIONS
 
 struct deleted_construct
@@ -204,7 +197,6 @@ BOOST_CHECK_SOFT_INTEGRAL_CONSTANT(::tt::has_trivial_constructor<wrap<trivial_ex
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_trivial_constructor<test_abc1>::value, false);
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_trivial_constructor<bug11324_derived>::value, false);
 
-BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_trivial_constructor<private_construct>::value, false);
 #ifndef BOOST_NO_CXX11_DELETED_FUNCTIONS
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_trivial_constructor<deleted_construct>::value, false);
 #endif
diff --git a/test/has_trivial_copy_test.cpp b/test/has_trivial_copy_test.cpp
index 043f76e..6a803b8 100644
--- a/test/has_trivial_copy_test.cpp
+++ b/test/has_trivial_copy_test.cpp
@@ -25,13 +25,6 @@ public:
 
 #endif
 
-struct private_copy
-{
-   private_copy();
-private:
-   private_copy(const private_copy&);
-};
-
 TT_TEST_BEGIN(has_trivial_copy)
 
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_trivial_copy<bool>::value, true);
@@ -227,7 +220,6 @@ BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_trivial_copy<test_abc1>::value, false);
 #ifndef BOOST_NO_CXX11_DELETED_FUNCTIONS
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_trivial_copy<bug_10389>::value, false);
 #endif
-BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_trivial_copy<private_copy>::value, false);
 
 TT_TEST_END
 
diff --git a/test/has_trivial_destructor_test.cpp b/test/has_trivial_destructor_test.cpp
index 3792004..960a575 100644
--- a/test/has_trivial_destructor_test.cpp
+++ b/test/has_trivial_destructor_test.cpp
@@ -22,13 +22,6 @@ struct deleted_destruct
 
 #endif
 
-struct private_destruct
-{
-   private_destruct();
-private:
-   ~private_destruct();
-};
-
 TT_TEST_BEGIN(has_trivial_destructor)
 
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_trivial_destructor<bool>::value, true);
@@ -187,7 +180,6 @@ BOOST_CHECK_SOFT_INTEGRAL_CONSTANT(::tt::has_trivial_destructor<wrap<trivial_exc
 BOOST_CHECK_SOFT_INTEGRAL_CONSTANT(::tt::has_trivial_destructor<wrap<trivial_except_construct> >::value, true, false);
 BOOST_CHECK_SOFT_INTEGRAL_CONSTANT(::tt::has_trivial_destructor<wrap<trivial_except_assign> >::value, true, false);
 
-BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_trivial_destructor<private_destruct>::value, false);
 #ifndef BOOST_NO_CXX11_DELETED_FUNCTIONS
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_trivial_destructor<deleted_destruct>::value, false);
 #endif
diff --git a/test/is_default_constr_test.cpp b/test/is_default_constr_test.cpp
index 89444b3..01a702c 100644
--- a/test/is_default_constr_test.cpp
+++ b/test/is_default_constr_test.cpp
@@ -37,15 +37,6 @@ struct deleted_default_construct
 
 #endif
 
-struct private_default_construct
-{
-private:
-   private_default_construct();
-public:
-   private_default_construct(char val) : member(val) {}
-   char member;
-};
-
 TT_TEST_BEGIN(is_default_constructible)
 
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<bool>::value, true);
@@ -198,7 +189,6 @@ BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<bug11324_derived>::
 #ifndef BOOST_NO_CXX11_DELETED_FUNCTIONS
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<deleted_default_construct>::value, false);
 #endif
-BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<private_default_construct>::value, false);
 
 TT_TEST_END
 
diff --git a/test/is_nothrow_move_constructible_test.cpp b/test/is_nothrow_move_constructible_test.cpp
index d756edc..3fdad74 100644
--- a/test/is_nothrow_move_constructible_test.cpp
+++ b/test/is_nothrow_move_constructible_test.cpp
@@ -14,13 +14,6 @@
 #  include <boost/type_traits/is_nothrow_move_constructible.hpp>
 #endif
 
-struct non_copy
-{
-   non_copy();
-private:
-   non_copy(const non_copy&);
-};
-
 #ifndef BOOST_NO_CXX11_DELETED_FUNCTIONS
 
 struct delete_copy
@@ -245,8 +238,6 @@ BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_move_constructible<nothrow_assign
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_move_constructible<nothrow_construct_UDT>::value, false);
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_move_constructible<test_abc1>::value, false);
 
-BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_move_constructible<non_copy>::value, false);
-
 #ifndef BOOST_NO_CXX11_DELETED_FUNCTIONS
 BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_move_constructible<delete_copy>::value, false);
 #endif
diff --git a/test/tricky_private_member_test.cpp b/test/tricky_private_member_test.cpp
new file mode 100644
index 0000000..b113fdf
--- /dev/null
+++ b/test/tricky_private_member_test.cpp
@@ -0,0 +1,71 @@
+
+//  (C) Copyright John Maddock 2015. 
+//  Use, modification and distribution are subject to the 
+//  Boost Software License, Version 1.0. (See accompanying file 
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#include "test.hpp"
+#include "check_integral_constant.hpp"
+#ifdef TEST_STD
+#  include <type_traits>
+#else
+#  include <boost/type_traits.hpp>
+#endif
+
+struct private_default_construct
+{
+private:
+   private_default_construct();
+public:
+   private_default_construct(char val) : member(val) {}
+   char member;
+};
+
+struct non_copy
+{
+   non_copy();
+private:
+   non_copy(const non_copy&);
+};
+
+struct non_assignable
+{
+   non_assignable();
+private:
+   non_assignable& operator=(const non_assignable&);
+};
+
+struct private_copy
+{
+   private_copy();
+private:
+   private_copy(const private_copy&);
+};
+
+struct private_destruct
+{
+   private_destruct();
+private:
+   ~private_destruct();
+};
+
+
+
+TT_TEST_BEGIN(tricky_private_members_test)
+
+BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_nothrow_constructor<private_default_construct>::value, false);
+#if !defined(BOOST_NO_CXX11_DECLTYPE) && !BOOST_WORKAROUND(BOOST_MSVC, < 1800)
+BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_nothrow_copy<non_copy>::value, false);
+#endif
+BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_trivial_assign<non_assignable>::value, false);
+BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_trivial_constructor<private_default_construct>::value, false);
+BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_trivial_copy<private_copy>::value, false);
+BOOST_CHECK_INTEGRAL_CONSTANT(::tt::has_trivial_destructor<private_destruct>::value, false);
+BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<private_default_construct>::value, false);
+BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_move_constructible<non_copy>::value, false);
+
+
+
+TT_TEST_END
+
+