#   This program is free software: you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation, either version 3 of the License, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# make sure all internal backslash quoting for array subscripts in arithmetic
# contexts is removed appropriately before the expression is evaluated

a=(0 1 2)
b=(0 1 2)
x=0

((i=$x,a[b[i]]))
let "i=$x,a[b[i]]"

echo $((i=$x,a[b[i]]))
for (( i=$x,a[b[i]]; i != 0; i--)); do echo a; done

yy[i=$x,a[b[i]]]=10
declare -p yy
unset yy

declare -i yy
yy=i=$x,a[b[i]]
unset yy

[[ i=$x,a[b[i]] -gt 0 ]]

echo ${var:i=$x,a[b[i]]:4}

unset i a b

xxxx=4
foo='$(echo xxxx)'

# errors

echo $(( $foo ))
echo $(( b[~foo/$xxxx] ))	# still attempts tilde expansion
echo $(( b[~foo * $xxxx] ))

# but associative arrays work, not arithmetic expressions
typeset -A b
xxxx=4
foo='$(echo comsub)'

echo $(( b[~foo * $xxxx] ))

# original report

x[3]=10 i=3 a[5]=42 p=15
# comparison throws error
(( a[p - x[i]] > 10)) && echo Y

# errors
foo=1
echo $(( 'foo' ))