13     fn len(&self) -> usize;  in len()  method
21         self.len() == 0  in is_empty()
27     fn len(&self) -> usize {  in len()  method
28         Bytes::len(self)  in len()
39     fn len(&self) -> usize {  in len()  method
40         BytesMut::len(self)  in len()
51     fn len(&self) -> usize {  in len()  method
52         <[u8]>::len(self)  in len()
66     fn len(&self) -> usize {  in len()  function
70         first_ref.len() + last_ref.len()  in len()
85     fn len(&self) -> usize {  in len()  function
89         limit.min(inner_ref.len())  in len()