81     fn read(&mut self, size: usize) -> Result<bytes::Bytes, p2::StreamError> {  in read()  argument
84             Err(_) => Err(p2::StreamError::trap("concurrent reads are not supported")),  in read()
87     fn skip(&mut self, size: usize) -> Result<usize, p2::StreamError> {  in skip()  argument
90             Err(_) => Err(p2::StreamError::trap("concurrent skips are not supported")),  in skip()
179     fn check_write(&mut self) -> Result<usize, p2::StreamError> {  in check_write()  argument
182             Err(_) => Err(p2::StreamError::trap("concurrent writes are not supported")),  in check_write()
185     fn write(&mut self, bytes: Bytes) -> Result<(), p2::StreamError> {  in write()  argument
188             Err(_) => Err(p2::StreamError::trap("concurrent writes not supported yet")),  in write()
191     fn flush(&mut self) -> Result<(), p2::StreamError> {  in flush()  argument
194             Err(_) => Err(p2::StreamError::trap(  in flush()
310             Err(p2::StreamError::Closed) => Poll::Ready(None),  in poll()
316             Err(p2::StreamError::LastOperationFailed(e)) => {  in poll()
321             Err(p2::StreamError::Trap(_)) => unreachable!(),  in poll()