# checks for array variables and positional parameter expansions losing quoted
# null string expansions -- problem through bash-5.1

set -- ''
myvar[0]=
a="${myvar[*]}"

recho "$*"
recho "${*}"

recho "${a}"
recho "${myvar[*]}"

recho "${a:+nonnull}"
recho "${myvar[*]:+nonnull}"

a="${myvar[@]}"

recho "$@"
recho "${@}"

recho "${a}"
recho "${myvar[@]}"

recho "${a:+nonnull}"
recho "${myvar[@]:+nonnull}"

# check to make sure literal CTLNULs are handled correctly
set -- $'\x7f'

recho "$@"
recho "${@}"
recho "${@:+nonnull}"

recho "$*"
recho "${*}"
recho "${*:+nonnull}"

shift $#

# these should echo nothing
recho "${@}"
recho "${@:+nonnull}"

unset -v a

# make sure that other null expansions result in null strings where appropriate
set -- ''
a[0]=

recho "$*"$x
recho "${*}"$x

recho "$@"$x
recho "${@}"$x

recho "${a[*]}"$x
recho "${a[@]}"$x


recho "$@"$x
recho "${@}"$x

recho "${a[*]}"
recho "${a[@]}"

