[GNATS 26591] Spurious diagnostic no suible user-defined conversion from "fat_executor" to "boost::asio::any_io_executor" exists

[jhsedg]

Customer bug ID

asio/test/any_io_executor.test/any_io_executor.cpp, gnats/26591.C

Description

​Full preprocessed test case is in gnats/26591.C
​
​cpfe -DTEST_NUMBER=1 --gnu_version=120100 -w --no_inlining --no_wrap_diagnostics --display_error --c++20 -tused Test_name.c
​"../libs/asio/test/any_io_executor.cpp", line 197: error #312: no suitable user-defined conversion from "fat_executor" to "
​boost::asio::any_io_executor" exists
​ boost::asio::any_io_executor ex6 = fat_executor(1);
​ ^
​
​"../libs/asio/test/any_io_executor.cpp", line 203: error #312: no suitable user-defined conversion from "fat_executor" to "
​boost::asio::any_io_executor" exists
​ boost::asio::any_io_executor ex7 = fat_executor(1);
​ ^
​
​"../libs/asio/test/any_io_executor.cpp", line 210: error #312: no suitable user-defined conversion from "fat_executor" to "
​boost::asio::any_io_executor" exists
​ boost::asio::any_io_executor ex8 = fat_executor(2);
​ ^