Add test/lookup_problem.cpp

test/Jamfile

@@ -18,3 +18,4 @@ project : requirements
 run quick.cpp ;
 run lambda2_test.cpp ;
 run version.cpp ;
+run lookup_problem.cpp ;

test/lookup_problem.cpp

@@ -0,0 +1,24 @@
+// Copyright 2021 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/lambda2.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+namespace N
+{
+    struct Irrelevant {};
+    void operator+( Irrelevant, Irrelevant );
+
+    int plus_one( int i )
+    {
+        using namespace boost::lambda2;
+        return (_1 + 1)( i );
+    }
+}
+
+int main()
+{
+    BOOST_TEST_EQ( plus_one( 4 ), 5 );
+    return boost::report_errors();
+}