Reclaim participant memory
Reclaim participant memory

crossbeam-rs/crossbeam,aturon/crossbeam,crossbeam-rs/crossbeam,ticki/baguette,schets/crossbeam,crossbeam-rs/crossbeam,Ticki/crossbeam,alexcrichton/crossbeam,steveklabnik/crossbeam,huonw/crossbeam,msullivan/crossbeam,crossbeam-rs/crossbeam,phil-opp/crossbeam