# change behavior of shell builtins to extend assoc_expand_once to indexed
# arrays

export subscript='$(echo INJECTION! >&2 ; echo 0)'
shopt -s array_expand_once

printf -v a["$subscript"] %s hi
declare -p a
unset a

printf -v "a[$subscript]" %s hi
declare -p a

a[0]=hi

unset a["$subscript"]
declare -p a

unset a

unset a["$subscript"]
declare -p a

unset -v a
read a["$subscript"] <<<hi
declare -p a

declare -a a
read a["$subscript"] <<<hi
declare -p a

unset -v a

declare -a a

{ sleep 1; exit 12; } & bgpid=$!
wait -n -p a["$subscript"] $bgpid

declare -p a

unset -v a
declare -a a

declare -i a["$subscript"]=42
declare -p a

# this still won't work because the quotes prevent it from being recognized as
# an assignment statement
#declare -i "a[$subscript]"=42
#declare -p a

test -v a["$subscript"] && echo set
[ -v a["$subscript"] ] && echo set

let a["$subscript"]+=1
unset -v a

# these are all already arithmetic expression errors

declare -a a

(( a[$subscript]++ ))
declare -p a
: $(( a[$subscript]++ ))
declare -p a

a[$subscript]=hi
declare -p a

# length shortcuts for unset variables, so give it a value
a[0]=zero
echo ${#a[$subscript]}

unset -v a

# compound assignments should not perform double expansion

a=( [$subscript]=hi )
declare -p a

declare -a a
a=( [$subscript]=hi )
declare -p a

unset -v a