555     pub fn readable(&self) -> StreamIter {  in readable()  argument
556         StreamIter::from(&self.readable)  in readable()
560     pub fn writable(&self) -> StreamIter {  in writable()  argument
561         StreamIter::from(&self.writable)  in writable()
565     pub fn almost_full(&self) -> StreamIter {  in almost_full()  argument
566         StreamIter::from(&self.almost_full)  in almost_full()
750 pub struct StreamIter {  struct
754 impl StreamIter {  impl
757         StreamIter {  in from()
763 impl Iterator for StreamIter {  implementation
772 impl ExactSizeIterator for StreamIter {  implementation