[libcxx] basic_string_view in .
@@ -54,5 +54,10 @@ _LIBCPP_BEGIN_NAMESPACE_STD
template <class T>
class _LIBCPP_TEMPLATE_VIS shared_ptr;
+ /* basic_string is already forward-declared in <iosfwd> */
+
+ template<class T, class Traits>
+ class basic_string_view;
+
_LIBCPP_END_NAMESPACE_STD
