// you're in.
fn spawn_sibling(~self, cur_task: ~Task, opts: TaskOpts, f: proc());
fn local_io<'a>(&'a mut self) -> Option<rtio::LocalIo<'a>>;
// you're in.
fn spawn_sibling(~self, cur_task: ~Task, opts: TaskOpts, f: proc());
fn local_io<'a>(&'a mut self) -> Option<rtio::LocalIo<'a>>;