1 // Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution.
4 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
5 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
7 // option. This file may not be copied, modified, or distributed
8 // except according to those terms.
11 #![warn(clippy::unused_io_amount)]
15 fn try_macro<T: io::Read + io::Write>(s: &mut T) -> io::Result<()> {
16 try!(s.write(b"test"));
17 let mut buf = [0u8; 4];
18 try!(s.read(&mut buf));
22 fn question_mark<T: io::Read + io::Write>(s: &mut T) -> io::Result<()> {
24 let mut buf = [0u8; 4];
29 fn unwrap<T: io::Read + io::Write>(s: &mut T) {
30 s.write(b"test").unwrap();
31 let mut buf = [0u8; 4];
32 s.read(&mut buf).unwrap();