message: delete unused try macro from read2.rs
diff: @@ -100,16 +100,6 @@ mod imp {
  done: bool,
  }
  - macro_rules! try {
  - ($e:expr) => (match $e {
  - Ok(e) => e,
  - Err(e) => {
  - println!("{} failed with {}", stringify!($e), e);
  - return Err(e)
  - }
  - })
  - }
  -
  pub fn read2(out_pipe: ChildStdout,
  err_pipe: ChildStderr,
  mut data: &mut FnMut(bool, &mut Vec<u8>, bool)) -> io::Result<()> {
  