Fix std::byte formatting in 11.2

Author: patstew

include/fmt/format.h

@@ -3850,15 +3850,15 @@ constexpr auto format_as(Enum e) noexcept -> underlying_t<Enum> {
 }  // namespace enums
 
 #ifdef __cpp_lib_byte
-template <> struct formatter<std::byte> : formatter<unsigned> {
-  static auto format_as(std::byte b) -> unsigned char {
-    return static_cast<unsigned char>(b);
-  }
-  template <typename Context>
-  auto format(std::byte b, Context& ctx) const -> decltype(ctx.out()) {
-    return formatter<unsigned>::format(format_as(b), ctx);
-  }
-};
+// template <> struct formatter<std::byte> : formatter<unsigned> {
+//   static auto format_as(std::byte b) -> unsigned char {
+//     return static_cast<unsigned char>(b);
+//   }
+//   template <typename Context>
+//   auto format(std::byte b, Context& ctx) const -> decltype(ctx.out()) {
+//     return formatter<unsigned>::format(format_as(b), ctx);
+//   }
+// };
 #endif
 
 struct bytes {
@@ -4231,6 +4231,13 @@ FMT_NODISCARD auto to_string(const T& value) -> std::string {
 FMT_END_EXPORT
 FMT_END_NAMESPACE
 
+namespace std {
+template <typename T, FMT_ENABLE_IF(std::is_same<T, std::byte>::value)>
+inline auto format_as(T b) -> unsigned char {
+  return static_cast<unsigned char>(b);
+}
+}  // namespace std
+
 #ifdef FMT_HEADER_ONLY
 #  define FMT_FUNC inline
 #  include "format-inl.h"