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# This isn't perfect behavior, but it establishes a baseline and will provide
# a way to detect behavior changes
echo a1
a[0]= a[1]=; recho "${a[@]:-y}"
unset a
echo a2
a[1]=; recho "${a[@]:-y}"
a[1]=; recho "${a[*]:-z}"
unset a
echo a3
a[0]= a[1]=x; recho "${a[@]:-y}"
unset a
echo a4
a[0]= a[1]=x; recho ${a[@]:+y}
unset a
echo p1
set '' ''
recho "${@:-y}"
shift $#
echo p2
set '' x
recho "${@:-y}"
shift $#
echo p3
set '' x
recho ${@:+y}
# problems with * and null expansions dating back to bash's earliest days
A=(''); set -- ''
echo "<${A[*]:-X}>" "<${*:-X}>" "<${A:-X}>" "<${A[0]:-X}>"
IFS=
A=('' ''); set -- '' ''
B=''
echo "<${A[*]:-X}>" "<${*:-X}>" "<${B:-X}>" "<${B[*]:-X}>"
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