https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107288
--- Comment #2 from Richard Hodges <hodges.r at gmail dot com> --- Some extra diagnostic. Reducing to this minimal program: ``` #include <boost/asio/awaitable.hpp> #include <boost/asio/co_spawn.hpp> #include <boost/asio/detached.hpp> #include <boost/asio/io_context.hpp> namespace asio = boost::asio; struct foo { std::string s; int i; }; struct bar : foo { bar(std::string s, int i) : foo { .s = std::move(s), .i = i } { } }; asio::awaitable< void > co_foo(foo) { std::printf("%s\n", __func__); co_return; }; asio::awaitable< void > co_bar(foo) { std::printf("%s\n", __func__); co_return; }; asio::awaitable< void > co_test() { // this works co_await co_bar(bar("Hello, World!", 1)); // this works but this crashes co_await co_foo({ .s = "Hello, World!", .i = 1 }); } int main() { asio::io_context ioc; asio::co_spawn(ioc, co_test(), asio::detached); ioc.run(); } ``` Output: ``` co_bar co_foo Segmentation fault (core dumped) ``` So it seems related to the interplay between designated initialisers and coroutines.