// C++N4606 Committee Draft, Standard for Programming Language C++
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/n4606.pdf
#define msg "C++N4606(232)18.6.1 Header <new> synopsis [new.syn]p498.cpp"
// Edited by Dr. Ogawa Kiyoshi. Compile procedure and results record.

#include <iostream>
#include <cstdlib>
#define implementation_defined 1

namespace std {
class bad_alloc;
class bad_array_new_length;
enum class align_val_t : size_t {};
struct nothrow_t {};
extern const nothrow_t nothrow;
using new_handler = void (*)();
new_handler get_new_handler() noexcept;
new_handler set_new_handler(new_handler new_p) noexcept;
// 18.6.4, pointer optimization barrier
template <class T> constexpr T* launder(T* p) noexcept;
// 18.6.5, hardware interference size

static constexpr size_t hardware_destructive_interference_size = implementation_defined ;
static constexpr size_t hardware_constructive_interference_size = implementation_defined ;
}
void* operator new(std::size_t size);
void* operator new(std::size_t size, std::align_val_t alignment);
void* operator new(std::size_t size, const std::nothrow_t&) noexcept;
void* operator new(std::size_t size, std::align_val_t alignment,
                   const std::nothrow_t&) noexcept;
void operator delete(void* ptr) noexcept;
void operator delete(void* ptr, std::size_t size) noexcept;
void operator delete(void* ptr, std::align_val_t alignment) noexcept;
void operator delete(void* ptr, std::size_t size, std::align_val_t alignment) noexcept;
void operator delete(void* ptr, const std::nothrow_t&) noexcept;
void operator delete(void* ptr, std::align_val_t alignment,
                     const std::nothrow_t&) noexcept;
void* operator new[](std::size_t size);
void* operator new[](std::size_t size, std::align_val_t alignment);
void* operator new[](std::size_t size, const std::nothrow_t&) noexcept;
void* operator new[](std::size_t size, std::align_val_t alignment,
                     const std::nothrow_t&) noexcept;
void operator delete[](void* ptr) noexcept;
void operator delete[](void* ptr, std::size_t size) noexcept;
void operator delete[](void* ptr, std::align_val_t alignment) noexcept;
void operator delete[](void* ptr, std::size_t size, std::align_val_t alignment) noexcept;
void operator delete[](void* ptr, const std::nothrow_t&) noexcept;
void operator delete[](void* ptr, std::align_val_t alignment,
                       const std::nothrow_t&) noexcept;
void* operator new (std::size_t size, void* ptr) noexcept;
void* operator new[](std::size_t size, void* ptr) noexcept;
void operator delete (void* ptr, void*) noexcept;
void operator delete[](void* ptr, void*) noexcept;

int main() {
//  std::cout << "std::is_iec559=" << std::is_iec559 << std::endl;
  std::cout<< msg << std::endl;
  return EXIT_SUCCESS;
}

$ ./cppwa17.sh p498
$ clang++ p498.cpp -std=c++17 -Wall
p498.cpp:13:12: error: redefinition of 'align_val_t'
enum class align_val_t : size_t {};
           ^
/usr/local/Cellar/llvm/6.0.0/include/c++/v1/new:165:29: note: previous definition is here
enum class _LIBCPP_ENUM_VIS align_val_t : size_t { };
                            ^
p498.cpp:14:8: error: redefinition of 'nothrow_t'
struct nothrow_t {};
       ^
/usr/local/Cellar/llvm/6.0.0/include/c++/v1/new:120:25: note: previous definition is here
struct _LIBCPP_TYPE_VIS nothrow_t {};
                        ^
2 errors generated.

$ g++-7 p498.cpp -std=c++17  -Wall
p498.cpp:13:12: error: multiple definition of 'enum class std::align_val_t'
 enum class align_val_t : size_t {};
            ^~~~~~~~~~~
In file included from /usr/local/Cellar/gcc/7.3.0_1/include/c++/7.3.0/bits/exception_ptr.h:40:0,
                 from /usr/local/Cellar/gcc/7.3.0_1/include/c++/7.3.0/exception:142,
                 from /usr/local/Cellar/gcc/7.3.0_1/include/c++/7.3.0/ios:39,
                 from /usr/local/Cellar/gcc/7.3.0_1/include/c++/7.3.0/ostream:38,
                 from /usr/local/Cellar/gcc/7.3.0_1/include/c++/7.3.0/iostream:39,
                 from p498.cpp:6:
/usr/local/Cellar/gcc/7.3.0_1/include/c++/7.3.0/new:83:14: note: previous definition here
   enum class align_val_t: size_t {};
              ^~~~~~~~~~~
p498.cpp:14:8: error: redefinition of 'struct std::nothrow_t'
 struct nothrow_t {};
        ^~~~~~~~~
In file included from /usr/local/Cellar/gcc/7.3.0_1/include/c++/7.3.0/bits/exception_ptr.h:40:0,
                 from /usr/local/Cellar/gcc/7.3.0_1/include/c++/7.3.0/exception:142,
                 from /usr/local/Cellar/gcc/7.3.0_1/include/c++/7.3.0/ios:39,
                 from /usr/local/Cellar/gcc/7.3.0_1/include/c++/7.3.0/ostream:38,
                 from /usr/local/Cellar/gcc/7.3.0_1/include/c++/7.3.0/iostream:39,
                 from p498.cpp:6:
/usr/local/Cellar/gcc/7.3.0_1/include/c++/7.3.0/new:86:10: note: previous definition of 'struct std::nothrow_t'
   struct nothrow_t
          ^~~~~~~~~