text: //===----------------------------------------------------------------------===//
  //
  //                     The LLVM Compiler Infrastructure
  //
  // This file is dual licensed under the MIT and the University of Illinois Open
  // Source Licenses. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  
  #include <cstddef>
  #include <test_macros.h>
  
  // UNSUPPORTED: c++98, c++03, c++11, c++14
  
  // template <class IntegerType>
  //   constexpr byte& operator>>=(byte& b, IntegerType shift) noexcept;
  // This function shall not participate in overload resolution unless
  //   is_integral_v<IntegerType> is true.
  
  
  constexpr std::byte test(std::byte b) {
  	return b >>= 2;
  	}
  
  
  int main () {
  	std::byte b;  // not constexpr, just used in noexcept check
  	constexpr std::byte b16{static_cast<std::byte>(16)};
  	constexpr std::byte b192{static_cast<std::byte>(192)};
  
  	static_assert(noexcept(b >>= 2), "" );
  
  	static_assert(std::to_integer<int>(test(b16))  ==  4, "" );
  	static_assert(std::to_integer<int>(test(b192)) == 48, "" );
  }
  