From 7690be8ec05cb350d9284564b51d12df2e4c78ce Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ole=20B=C3=B8e?=
 <94781160+cptFracassa@users.noreply.github.com>
Date: Mon, 13 Nov 2023 13:31:32 +0100
Subject: [PATCH] fix: support optional<T> with format_as(T)

Formatting a std::optional<T> where T had a custom format_as(T) function failed to compile with clang,
due to set_debug_format being hidden by private inheritance. This fix makes the function available through a using clause.
---
 include/fmt/format.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/fmt/format.h b/include/fmt/format.h
index 4104d91fc7cd3..f34c97b11c742 100644
--- a/include/fmt/format.h
+++ b/include/fmt/format.h
@@ -4053,6 +4053,7 @@ struct formatter<T, Char, enable_if_t<detail::has_format_as<T>::value>>
     : private formatter<detail::format_as_t<T>, Char> {
   using base = formatter<detail::format_as_t<T>, Char>;
   using base::parse;
+  using base::set_debug_format;
 
   template <typename FormatContext>
   auto format(const T& value, FormatContext& ctx) const -> decltype(ctx.out()) {