/usr/bin/raco is in racket 6.3-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | #!/bin/sh
# This script was created by make-mzscheme-launcher
# {{{ bindir
bindir="/usr/bin"
# }}} bindir
exec "${bindir}/racket" -N "$0" '-l-' 'raco/main.rkt' ${1+"$@"}
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