From 4400d355914545cc31f34edce8c238baf6fce546 Mon Sep 17 00:00:00 2001
From: Victor Zverovich <viz@meta.com>
Date: Tue, 2 Jan 2024 19:14:32 -0800
Subject: [PATCH] Clarify why we can't have nice things

---
 include/fmt/core.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/fmt/core.h b/include/fmt/core.h
index e5b1e4f08eb3..c060ed7cbc2c 100644
--- a/include/fmt/core.h
+++ b/include/fmt/core.h
@@ -1305,6 +1305,7 @@ template <typename Context> class value {
 
   template <typename T> FMT_CONSTEXPR20 FMT_INLINE value(T& val) {
     using value_type = remove_const_t<T>;
+    // T may overload operator& e.g. std::vector<bool>::reference in libc++.
 #ifdef __cpp_if_constexpr
     if constexpr (std::is_same<decltype(&val), T*>::value)
       custom.value = const_cast<value_type*>(&val);