libstdc++: LWG 3292 iota_view is under-constrained

libstdc++-v3/ChangeLog:

	LWG 3292 iota_view is under-constrained
	* include/std/ranges (iota_view): Require that _Winc models semiregular
	  as per LWG 3292.
	* testsuite/std/ranges/iota/lwg3292_neg.cc: New test.

libstdc++-v3/ChangeLog

+2020-02-25  Patrick Palka  <ppalka@redhat.com>
+
+	LWG 3292 iota_view is under-constrained
+	* include/std/ranges (iota_view): Require that _Winc models semiregular
+	  as per LWG 3292.
+	* testsuite/std/ranges/iota/lwg3292_neg.cc: New test.
+
 2020-02-25  Jonathan Wakely  <jwakely@redhat.com>
 
 	* include/bits/ranges_algobase.h (__copy_or_move): Do not use memmove

libstdc++-v3/include/std/ranges

@@ -615,6 +615,7 @@ namespace ranges
   template<weakly_incrementable _Winc,
 	   semiregular _Bound = unreachable_sentinel_t>
     requires std::__detail::__weakly_eq_cmp_with<_Winc, _Bound>
+      && semiregular<_Winc>
     class iota_view : public view_interface<iota_view<_Winc, _Bound>>
     {
     private:

libstdc++-v3/testsuite/std/ranges/iota/lwg3292_neg.cc

+// Copyright (C) 2020 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-options "-std=gnu++2a" }
+// { dg-do compile { target c++2a } }
+
+#include <sstream>
+#include <ranges>
+
+namespace ranges = std::ranges;
+namespace views = std::views;
+
+void
+test01()
+{
+  std::istringstream s("1 2 3 4 5");
+  auto v = ranges::istream_view<int>(s);
+  auto i = v.begin();
+  static_assert(!std::semiregular<decltype(i)>);
+  auto o = views::iota(std::move(i));
+  static_assert(false); // { dg-error "" }
+}
+
+// { dg-prune-output "no match" }
+// { dg-prune-output "deduction failed" }
+// { dg-prune-output "constraint failure" }