https://github.com/boostorg/asio/issues/437
https://github.com/boostorg/asio/commit/6ca7c4726e05

--- CMakeLists.txt.orig	2024-03-01 07:57:00 UTC
+++ CMakeLists.txt
@@ -275,6 +275,7 @@ add_definitions(-DBOOST_ASIO_DISABLE_CONCEPTS)
 
 # boost asio's concept usage doesn't play nicely with some compilers yet.
 add_definitions(-DBOOST_ASIO_DISABLE_CONCEPTS)
+add_definitions(-Dasync_operation=typename) # XXX Remove after Boost 1.87 upgrade
 if (MSVC)
     add_compile_options($<$<COMPILE_LANGUAGE:CXX>:/std:c++20>)