From b15699aba964488d700475f9c161b1f08bbf9dab Mon Sep 17 00:00:00 2001
From: timsong-cpp <rs2740@gmail.com>
Date: Fri, 18 Mar 2022 09:23:06 -0500
Subject: [PATCH] Issue #2816: also strip named-arg for the fallback formatter

---
 include/fmt/core.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/fmt/core.h b/include/fmt/core.h
index 43bca2fbb050..106fd6fe8760 100644
--- a/include/fmt/core.h
+++ b/include/fmt/core.h
@@ -2665,13 +2665,14 @@ FMT_CONSTEXPR auto parse_format_specs(ParseContext& ctx)
     -> decltype(ctx.begin()) {
   using char_type = typename ParseContext::char_type;
   using context = buffer_context<char_type>;
+  using stripped_type = typename strip_named_arg<T>::type;
   using mapped_type = conditional_t<
       mapped_type_constant<T, context>::value != type::custom_type,
       decltype(arg_mapper<context>().map(std::declval<const T&>())),
-      typename strip_named_arg<T>::type>;
+      stripped_type>;
   auto f = conditional_t<has_formatter<mapped_type, context>::value,
                          formatter<mapped_type, char_type>,
-                         fallback_formatter<T, char_type>>();
+                         fallback_formatter<stripped_type, char_type>>();
   return f.parse(ctx);
 }