message: Fix typo in is_comparable
diff: @@ -185,7 +185,7 @@ class is_comparable {
  static_cast<T1*>(nullptr), static_cast<T2*>(nullptr),
  static_cast<bool*>(nullptr),
  std::integral_constant<bool, std::is_arithmetic<T1>::value
  - && std::is_arithmetic<T1>::value>{}));
  + && std::is_arithmetic<T2>::value>{}));
  public:
  static constexpr bool value = std::is_same<bool, result_type>::value;
  