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diff --git a/src/boost/libs/contract/test/public_function/protected.cpp b/src/boost/libs/contract/test/public_function/protected.cpp
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+++ b/src/boost/libs/contract/test/public_function/protected.cpp
@@ -0,0 +1,88 @@
+
+// Copyright (C) 2008-2018 Lorenzo Caminiti
+// Distributed under the Boost Software License, Version 1.0 (see accompanying
+// file LICENSE_1_0.txt or a copy at http://www.boost.org/LICENSE_1_0.txt).
+// See: http://www.boost.org/doc/libs/release/libs/contract/doc/html/index.html
+
+// Test overriding function never overrides protected function contract.
+
+#include "../detail/oteststream.hpp"
+#include <boost/contract/function.hpp>
+#include <boost/contract/public_function.hpp>
+#include <boost/contract/base_types.hpp>
+#include <boost/contract/check.hpp>
+#include <boost/detail/lightweight_test.hpp>
+#include <sstream>
+
+boost::contract::test::detail::oteststream out;
+
+struct b {
+    static void static_invariant() { out << "b::static_inv" << std::endl; }
+    void invariant() const { out << "b::inv" << std::endl; }
+
+protected:
+    // NOTE: This is the correct way of programming contracts for overridden
+    // protected and overriding public functions: Both must use virtual_
+    // (otherwise C++ won't override because mismatching parameters), but
+    // overridden protected does not use public_function.
+    virtual void f(boost::contract::virtual_* /* v */ = 0) {
+        boost::contract::check c = boost::contract::function()
+            .precondition([] { out << "b::f::pre" << std::endl; })
+            .old([] { out << "b::f::old" << std::endl; })
+            .postcondition([] { out << "b::f::post" << std::endl; })
+        ;
+        out << "b::f::body" << std::endl;
+    }
+};
+struct a
+    #define BASES public b
+    : BASES
+{
+    typedef BOOST_CONTRACT_BASE_TYPES(BASES) base_types;
+    #undef BASES
+
+    static void static_invariant() { out << "a::static_inv" << std::endl; }
+    void invariant() const { out << "a::inv" << std::endl; }
+
+    void f(boost::contract::virtual_* v = 0) /* not override */ {
+        // C++ func a::f overrides b::f, but contracts don't (so no override_f).
+        boost::contract::check c = boost::contract::public_function(v, this)
+            .precondition([] { out << "a::f::pre" << std::endl; })
+            .old([] { out << "a::f::old" << std::endl; })
+            .postcondition([] { out << "a::f::post" << std::endl; })
+        ;
+        out << "a::f::body" << std::endl;
+    }
+};
+
+int main() {
+    std::ostringstream ok;
+
+    a aa;
+    out.str("");
+    aa.f();
+    ok.str(""); ok
+        #ifndef BOOST_CONTRACT_NO_ENTRY_INVARIANTS
+            << "a::static_inv" << std::endl
+            << "a::inv" << std::endl
+        #endif
+        #ifndef BOOST_CONTRACT_NO_PRECONDITIONS
+            << "a::f::pre" << std::endl
+        #endif
+        #ifndef BOOST_CONTRACT_NO_OLDS
+            << "a::f::old" << std::endl
+        #endif
+        << "a::f::body" << std::endl
+        #ifndef BOOST_CONTRACT_NO_EXIT_INVARIANTS
+            << "a::static_inv" << std::endl
+            << "a::inv" << std::endl
+        #endif
+        #ifndef BOOST_CONTRACT_NO_POSTCONDITIONS
+            << "a::f::post" << std::endl
+        #endif
+    ;
+    BOOST_TEST(out.eq(ok.str()));
+    
+    return boost::report_errors();
+}
+