U - falseU - truegood first issuereported-launchpad
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描述
it should start with Usage:
Reported here: https://bugs.launchpad.net/ubuntu/+source/rust-coreutils/+bug/2137580
$ LANG=C cargo run -q --features unix false --help|head -1
Returns false, an unsuccessful exit status.
with GNU:
LANG=C /usr/bin/false --help|head -1
Usage: /usr/bin/false [ignored command line arguments]
same for true