https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95111
--- Comment #11 from Avi Kivity <a...@cloudius-systems.com> --- I started a conversation on the std-proposals list about this. Meanwhile, how about a -fnonstandard-coroutines-that-actually-work flag that captures the parameter to a non-static member function coroutine by value, if it is an rvalue when the call happens? Without it, lambda coroutines are useless for asynchronous coroutines.
