From 780fa3161f88f4cc7115ea52fa363653861d95dc Mon Sep 17 00:00:00 2001
From: Chahatpreet Singh <c@chahat.dev>
Date: Fri, 8 May 2026 15:53:26 -0500
Subject: [PATCH] Fix type_traits_test.cpp

---
 test/unittest/type_traits_test.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/test/unittest/type_traits_test.cpp b/test/unittest/type_traits_test.cpp
index 164cc79..123b3a2 100644
--- a/test/unittest/type_traits_test.cpp
+++ b/test/unittest/type_traits_test.cpp
@@ -1,5 +1,6 @@
 #include "atcoder/internal_type_traits"
 
+#include <climits>
 #include <type_traits>
 
 #include <gtest/gtest.h>
@@ -44,7 +45,12 @@ static_assert(internal::is_unsigned_int<unsigned long long>::value, "");
 static_assert(!internal::is_signed_int<A>::value, "");
 static_assert(!internal::is_unsigned_int<A>::value, "");
 
+#if CHAR_MIN < 0
 static_assert(is_same<unsigned char, internal::to_unsigned_t<char>>::value, "");
+#else
+static_assert(is_same<char, internal::to_unsigned_t<char>>::value, "");
+#endif
+
 static_assert(
     is_same<unsigned char, internal::to_unsigned_t<signed char>>::value,
     "");