text: //===----------------------------------------------------------------------===//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  
  // <ranges>
  
  // UNSUPPORTED: c++03, c++11, c++14, c++17
  // UNSUPPORTED: libcpp-no-concepts
  // UNSUPPORTED: libcpp-has-no-incomplete-ranges
  
  #include <ranges>
  
  #include "test_macros.h"
  #include "test_iterators.h"
  
  struct SimpleView : std::ranges::view_base {
    friend int* begin(SimpleView&);
    friend int* begin(SimpleView const&);
    friend int* end(SimpleView&);
    friend int* end(SimpleView const&);
  };
  
  struct WrongConstView : std::ranges::view_base {
    friend       int* begin(WrongConstView&);
    friend const int* begin(WrongConstView const&);
    friend       int* end(WrongConstView&);
    friend const int* end(WrongConstView const&);
  };
  
  struct NoConstView : std::ranges::view_base {
    friend int* begin(NoConstView&);
    friend int* end(NoConstView&);
  };
  
  struct DifferentSentinel : std::ranges::view_base {
    friend int* begin(DifferentSentinel&);
    friend int* begin(DifferentSentinel const&);
    friend sentinel_wrapper<int*> end(DifferentSentinel&);
    friend sentinel_wrapper<int*> end(DifferentSentinel const&);
  };
  
  static_assert( std::ranges::__simple_view<SimpleView>);
  static_assert(!std::ranges::__simple_view<WrongConstView>);
  static_assert(!std::ranges::__simple_view<NoConstView>);
  static_assert(!std::ranges::__simple_view<DifferentSentinel>);
  