gcc/testsuite/g++.dg/ext/pr94197.C

// { dg-do compile { target c++11 } }

template<typename T>
  T&& declval() noexcept;

template<bool B>
struct bool_constant
{
  static constexpr bool value = B;
  using type = bool_constant;
};

using true_type = bool_constant<true>;
using false_type = bool_constant<false>;

template<bool, typename T, typename Arg>
  struct __is_nt_constructible_impl
  : public false_type
  { };

template<typename T, typename Arg>
  struct __is_nt_constructible_impl<true, T, Arg>
  : public bool_constant<noexcept(static_cast<T>(declval<Arg>()))>
  { };

template<typename T, typename Arg>
  using __is_nothrow_constructible_impl
    = __is_nt_constructible_impl<__is_constructible(T, Arg), T, Arg>;

template<typename T>
  struct __is_nothrow_copy_constructible_impl
  : public __is_nothrow_constructible_impl<T, const T&>
  { };

template<typename T>
  struct is_nothrow_copy_constructible
  : public __is_nothrow_copy_constructible_impl<T>::type
  { };

template<bool, typename T, typename Arg>
  struct __is_nt_assignable_impl
  : public false_type
  { };

template<typename T, typename Arg>
  struct __is_nt_assignable_impl<true, T, Arg>
  : public bool_constant<noexcept(declval<T&>() = declval<Arg>())>
  { };

template<typename T, typename Arg>
  using __is_nothrow_assignable_impl
    = __is_nt_assignable_impl<__is_assignable(T, Arg), T, Arg>;

template<typename T>
  struct __is_nothrow_copy_assignable_impl
  : public __is_nothrow_assignable_impl<T, const T&>
  { };

template<typename T>
  struct is_nothrow_copy_assignable
  : public __is_nothrow_copy_assignable_impl<T>::type
  { };

struct NType
{
  NType();
private:
  NType(const NType&);
  NType& operator=(const NType&);
};


static_assert( !is_nothrow_copy_constructible<NType>::value, "" );
static_assert( !is_nothrow_copy_assignable<NType>::value, "" );