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# first try some invalid patterns (do in subshell due to parsing error)
# (set argv0 to "SHELL" to avoid "/path/to/shell: blah" in error messages)
"$THIS_SH" -c 'echo ${:-}' SHELL
# now some funky ones
echo _${#-} _${#:-}
# now some valid ones
set --
echo _$1 _${1-} _${1:-} _${1-word} _${1:-word}
set -- aaaa
echo _$1 _${1-} _${1:-} _${1-word} _${1:-word}
unset f
echo _$f _${f-} _${f:-} _${f-word} _${f:-word}
f=
echo _$f _${f-} _${f:-} _${f-word} _${f:-word}
f=fff
echo _$f _${f-} _${f:-} _${f-word} _${f:-word}
set --
set -- "${1-}"; echo 1:$#
set --
set -- ${1-}; echo 0:$#
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