diff --git a/test/has_binary_operators.hpp b/test/has_binary_operators.hpp
index 681cde9..165dad9 100644
--- a/test/has_binary_operators.hpp
+++ b/test/has_binary_operators.hpp
@@ -86,6 +86,14 @@ inline bool operator BOOST_TT_TRAIT_OP (const C&, void*) { return true; }
 inline bool operator BOOST_TT_TRAIT_OP (void*, const D&) { return true; }
 inline bool operator BOOST_TT_TRAIT_OP (const C&, const D&) { return true; }
 
+struct private_op { private: void operator BOOST_TT_TRAIT_OP (const private_op&); };
+
+struct ambiguous_A 
+{ 
+};
+bool operator BOOST_TT_TRAIT_OP (const ambiguous_A&, const ambiguous_A&);
+struct ambiguous_B { operator ambiguous_A()const; };
+
 //class internal_private { ret operator BOOST_TT_TRAIT_OP (const internal_private&) const; };
 
 void common() {
@@ -144,6 +152,17 @@ void common() {
    TEST_TR(Derived2, bool, true);
 // compile time error
 // TEST_T(internal_private, false);
+#if !defined(BOOST_NO_SFINAE_EXPR) && !defined(BOOST_NO_CXX11_DECLTYPE) && !BOOST_WORKAROUND(BOOST_MSVC, < 1900)
+// There are some things that pass that wouldn't otherwise do so:
+#if !BOOST_WORKAROUND(BOOST_MSVC, < 1910)
+   TEST_TR(private_op, bool, false);
+   TEST_T(private_op, false);
+#endif
+   TEST_TR(ambiguous_A, bool, true);
+   TEST_T(ambiguous_A, true);
+   TEST_TR(ambiguous_B, bool, true);
+   TEST_T(ambiguous_B, true);
+#endif
 }
 
 }
diff --git a/test/has_equal_to_test.cpp b/test/has_equal_to_test.cpp
index d987065..08ca61b 100644
--- a/test/has_equal_to_test.cpp
+++ b/test/has_equal_to_test.cpp
@@ -219,6 +219,15 @@ void specific() {
    BOOST_CHECK_INTEGRAL_CONSTANT((::boost::BOOST_TT_TRAIT_NAME< int* const &, int* &, int & >::value), 0);
    BOOST_CHECK_INTEGRAL_CONSTANT((::boost::BOOST_TT_TRAIT_NAME< int* const &, int* const &, int const & >::value), 1);
 
+#if !defined(BOOST_NO_SFINAE_EXPR) && !defined(BOOST_NO_CXX11_DECLTYPE) && !BOOST_WORKAROUND(BOOST_MSVC, < 1900)
+   // There are some things that pass that wouldn't otherwise do so:
+   auto f = []() {};
+#ifndef BOOST_MSVC
+   TEST_TR(decltype(f), bool, true);
+#else
+   TEST_TR(decltype(f), bool, false);
+#endif
+#endif
 }
 
 TT_TEST_BEGIN(BOOST_TT_TRAIT_NAME)