Patrick Palka 6aa2ca21a4 libstdc++: Add missing friend declaration to join_view::_Sentinel
The converting constructor of join_view::_Sentinel<true> needs to be able to
access the private members of join_view::_Sentinel<false>.

libstdc++-v3/ChangeLog:

	* include/std/ranges (join_view::_Sentinel<_Const>): Befriend
	join_view::_Sentinel<!_Const>.
	* testsuite/std/ranges/adaptors/join.cc: Augment test.
2020-03-06 09:23:10 -05:00
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