libstdc++: Implement LWG 3553 changes to split_view

libstdc++-v3/ChangeLog:

	* include/std/ranges (split_view::_OuterIter::value_type::begin):
	Remove the non-const overload, and remove the copyable constraint
	on the const overload as per LWG 3553.

diff --git a/libstdc++-v3/include/std/ranges b/libstdc++-v3/include/std/ranges
index f93a880ff8a89e632466d054e43cfd9dd272b9b8..ff093bfdf9319a58b7208fc22b6067c98a2b8078 100644 (file)
--- a/libstdc++-v3/include/std/ranges
+++ b/libstdc++-v3/include/std/ranges
@@ -2932,14 +2932,8 @@ namespace views::__adaptor
 
            constexpr _InnerIter<_Const>
            begin() const
-             requires copyable<_OuterIter>
            { return _InnerIter<_Const>{_M_i}; }
 
-           constexpr _InnerIter<_Const>
-           begin()
-             requires (!copyable<_OuterIter>)
-           { return _InnerIter<_Const>{std::move(_M_i)}; }
-
            constexpr default_sentinel_t
            end() const
            { return default_sentinel; }