5 #![warn(unused_io_amount)]
9 // FIXME: compiletest doesn't understand errors from macro invocation span
10 fn try_macro<T: io::Read + io::Write>(s: &mut T) -> io::Result<()> {
11 try!(s.write(b"test"));
12 let mut buf = [0u8; 4];
13 try!(s.read(&mut buf));
17 fn question_mark<T: io::Read + io::Write>(s: &mut T) -> io::Result<()> {
19 let mut buf = [0u8; 4];
24 fn unwrap<T: io::Read + io::Write>(s: &mut T) {
25 s.write(b"test").unwrap();
26 let mut buf = [0u8; 4];
27 s.read(&mut buf).unwrap();