From f526e71aa02661713e5f6ac2b189c50eb46831f8 Mon Sep 17 00:00:00 2001
From: Vladislav Shchapov <vladislav@shchapov.ru>
Date: Thu, 1 Sep 2022 19:56:07 +0500
Subject: [PATCH] Fix for issue #3068

Signed-off-by: Vladislav Shchapov <vladislav@shchapov.ru>
---
 include/fmt/std.h | 3 ++-
 test/std-test.cc  | 3 +++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/fmt/std.h b/include/fmt/std.h
index 41d2b283..fd575958 100644
--- a/include/fmt/std.h
+++ b/include/fmt/std.h
@@ -104,7 +104,8 @@ using variant_index_sequence =
 template <typename T, typename U = void>
 struct is_variant_like_ : std::false_type {};
 template <typename T>
-struct is_variant_like_<T, std::void_t<decltype(std::variant_size<T>::value)>>
+struct is_variant_like_<
+    T, std::void_t<decltype(std::variant_size<std::remove_cv_t<T>>::value)>>
     : std::true_type {};
 
 // formattable element check
diff --git a/test/std-test.cc b/test/std-test.cc
index c22b3e38..671a9b4c 100644
--- a/test/std-test.cc
+++ b/test/std-test.cc
@@ -75,5 +75,8 @@ TEST(std_test, variant) {
 
   EXPECT_EQ(fmt::format("{}", v4), "variant(monostate)");
   EXPECT_EQ(fmt::format("{}", v5), "variant(\"yes, this is variant\")");
+
+  volatile int i = 42;
+  EXPECT_EQ(fmt::format("{}", i), "42");
 #endif
 }