hostname > /dev/full panics

```bash
$ ./target/release/coreutils hostname > /dev/full

thread 'main' (1531) panicked at library/std/src/io/stdio.rs:1165:9:
failed printing to stdout: No space left on device (os error 28)
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Aborted (core dumped)
```