Zero-length arrays are an extension

include/boost/mp11/algorithm.hpp

@@ -907,15 +907,11 @@ template<class... T, class F> BOOST_CONSTEXPR F mp_for_each_impl( mp_list<T...>,
     return (void)A{ ((void)f(T()), 0)... }, std::forward<F>(f);
 }
 
-#if BOOST_WORKAROUND( BOOST_MSVC, <= 1800 )
-
 template<class F> BOOST_CONSTEXPR F mp_for_each_impl( mp_list<>, F && f )
 {
     return std::forward<F>(f);
 }
 
-#endif
-
 } // namespace detail
 
 template<class L, class F> BOOST_CONSTEXPR F mp_for_each( F && f )