Add a test with N=1089 to mp_find.cpp

test/mp_find.cpp

@@ -59,5 +59,16 @@ int main()
         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_find<L5, X2>, mp_size_t<1>>));
     }
 
+    {
+        using boost::mp11::mp_iota_c;
+
+        int const N = 1089;
+
+        using L = mp_iota_c<N>;
+        using R = mp_find<L, mp_size_t<N/2>>;
+
+        BOOST_TEST_TRAIT_TRUE((std::is_same<R, mp_size_t<N/2>>));
+    }
+
     return boost::report_errors();
 }