find/xargs --help/--version >/dev/full panics

``` $ target/debug/find --version > /dev/full thread 'main' (19061) 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 ```