Add is_range_test3

test/Jamfile.v2

@@ -97,3 +97,5 @@ run hash_unordered_multimap_test.cpp ;
 
 run hash_unordered_set_test.cpp ;
 run hash_unordered_map_test.cpp ;
+
+run is_range_test3.cpp ;

test/is_range_test3.cpp

@@ -0,0 +1,41 @@
+// Copyright 2022 Peter Dimov.
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/type_traits/integral_constant.hpp>
+
+struct X1
+{
+    char const* begin() const;
+    char const* end() const;
+};
+
+struct X2
+{
+    char const* begin() const;
+    char const* end() const;
+};
+
+namespace boost
+{
+namespace container_hash
+{
+
+template<class T> struct is_range;
+template<> struct is_range<X2>: boost::false_type {};
+
+} // namespace container_hash
+} // namespace boost
+
+#include <boost/container_hash/is_range.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+
+int main()
+{
+    using boost::container_hash::is_range;
+
+    BOOST_TEST_TRAIT_TRUE((is_range<X1>));
+    BOOST_TEST_TRAIT_FALSE((is_range<X2>));
+
+    return boost::report_errors();
+}