$ fq
exitcode: 2
stderr:
Usage: fq [OPTIONS] [--] [EXPR] [FILE...]
$ fq -n '1+"a"'
exitcode: 5
stderr:
error: cannot add: number (1) and string ("a")
$ fq -n '"abc" | halt_error(123)'
exitcode: 123
stderr:
error: abc
$ fq -n 'null | halt_error(123)'
exitcode: 123
$ fq -n invalid
exitcode: 3
stderr:
error: arg: function not defined: invalid/0
$ fq -n "("
exitcode: 3
stderr:
error: arg:1:1: unexpected EOF
$ fq . non-existing
exitcode: 2
stderr:
error: non-existing: no such file or directory