From b43ce472fa3b3972a4030cc8c229f5b04b8b2fa5 Mon Sep 17 00:00:00 2001
From: Ed Catmur <ed@catmur.uk>
Date: Wed, 28 Jun 2023 11:12:42 -0500
Subject: [PATCH] Fix libc++16 failures

Similar to https://github.com/boostorg/core/commit/de8fe4fad7a4a843e6d0dfdaa2a4962fa8e0d50f
---
 test/hash_is_avalanching_test.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/test/hash_is_avalanching_test.cpp b/test/hash_is_avalanching_test.cpp
index 64af482..c31c56b 100644
--- a/test/hash_is_avalanching_test.cpp
+++ b/test/hash_is_avalanching_test.cpp
@@ -35,7 +35,11 @@ int main()
 
 #endif
 
+#if defined(_LIBCPP_VERSION) && _LIBCPP_VERSION >= 160000
+// std::char_traits<Ch> is deprecated for non-char types
+#else
     BOOST_TEST_TRAIT_FALSE(( hash_is_avalanching< boost::hash<std::basic_string<my_char> > > ));
+#endif
 
     return boost::report_errors();
 }