From 3eb3aef5753b91d689b496a629b9dc5c4a7cd348 Mon Sep 17 00:00:00 2001
From: Victor Zverovich <viz@meta.com>
Date: Sat, 23 Dec 2023 08:32:36 -0800
Subject: [PATCH] Fix handling of set_debug_format

---
 include/fmt/format.h |  7 ++-----
 test/ranges-test.cc  | 13 +++++++++++++
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/include/fmt/format.h b/include/fmt/format.h
index dd04a79e..6caa4f9d 100644
--- a/include/fmt/format.h
+++ b/include/fmt/format.h
@@ -4097,13 +4097,10 @@ class format_int {
 
 template <typename T, typename Char>
 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;
-
+    : formatter<detail::format_as_t<T>, Char> {
   template <typename FormatContext>
   auto format(const T& value, FormatContext& ctx) const -> decltype(ctx.out()) {
+    using base = formatter<detail::format_as_t<T>, Char>;
     return base::format(format_as(value), ctx);
   }
 };
diff --git a/test/ranges-test.cc b/test/ranges-test.cc
index ba5c464d..c67eed9f 100644
--- a/test/ranges-test.cc
+++ b/test/ranges-test.cc
@@ -528,3 +528,16 @@ TEST(ranges_test, container_adaptor) {
     EXPECT_EQ(fmt::format("{}", m), "[1, 2]");
   }
 }
+
+struct tieable {
+  int a = 3;
+  double b = 0.42;
+};
+
+auto format_as(const tieable& t) -> std::tuple<int, double> {
+  return std::tie(t.a, t.b);
+}
+
+TEST(ranges_test, format_as_tie) {
+  EXPECT_EQ(fmt::format("{}", tieable()), "(3, 0.42)");
+}