From 5f0572acdca120e11f6d810765d7a6a3c593fcbb Mon Sep 17 00:00:00 2001
From: Victor Zverovich <viz@meta.com>
Date: Sat, 18 Jan 2025 09:00:22 -0800
Subject: [PATCH] Workaround a compilation error on gcc 9.4

---
 include/fmt/format.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/fmt/format.h b/include/fmt/format.h
index 9cd523a9e6a5..4466b4f4d24b 100644
--- a/include/fmt/format.h
+++ b/include/fmt/format.h
@@ -227,7 +227,9 @@ FMT_CONSTEXPR inline void abort_fuzzing_if(bool condition) {
 #if defined(FMT_USE_STRING_VIEW)
 template <typename Char> using std_string_view = std::basic_string_view<Char>;
 #else
-template <typename T> struct std_string_view {};
+template <typename Char> struct std_string_view {
+  operator basic_string_view<Char>() const;
+};
 #endif
 
 template <typename Char, Char... C> struct string_literal {