# first try some invalid patterns (do in subshell due to parsing error)
-hush -c 'echo ${+} ; echo moo'
-hush -c 'echo ${:+} ; echo moo'
+"$THIS_SH" -c 'echo ${+} ; echo moo'
+"$THIS_SH" -c 'echo ${:+} ; echo moo'
# now some funky ones
echo _${#+} _${#:+}