From 43582c078d1916cb6ffed1639d9caa1676fce32c Mon Sep 17 00:00:00 2001
From: Barry Revzin <barry.revzin@gmail.com>
Date: Fri, 24 Dec 2021 12:59:50 -0600
Subject: [PATCH] Adding iterator_category to counting_iterator.

---
 include/fmt/format.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/fmt/format.h b/include/fmt/format.h
index 9d792acc..2788e0eb 100644
--- a/include/fmt/format.h
+++ b/include/fmt/format.h
@@ -1947,6 +1947,8 @@ FMT_CONSTEXPR auto write(OutputIt out, basic_string_view<Char> s,
   if (specs.width != 0) {
     if (is_debug) {
       struct counting_iterator {
+        using iterator_category = std::output_iterator_tag;
+
         int n = 0;
         struct proxy {
           int& n;