https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61118
--- Comment #11 from Yuri Gribov <tetra2005 at gmail dot com> ---
(In reply to Tavian Barnes from comment #10)
> > I think it is - __cancel_arg is assigned inside a while loop
>
> Specifically a do { } while(0); loop, which obviously has only one iteration.
Actually I was talking about surrounding while
((double)future->progress/future->total < progress)...
