IFS=,

SPECIAL="break,\
	:,\
	continue,\
	. /dev/null,
	eval,
	exec,
	export -p,
	readonly -p,
	set,
	shift 0,
	times,
	trap,
	unset foo"

UTILS="alias,\
	bg,\
	bind,\
	cd,\
	command echo,\
	echo,\
	false,\
	fc -l,\
	fg,\
	getopts a var,\
	hash,\
	jobs,\
	printf a,\
	pwd,\
	read var < /dev/null,\
	test,\
	true,\
	type ls,\
	ulimit,\
	umask,\
	unalias -a,\
	wait"

set -e

# For special built-ins variable assignments affect the shell environment.
set -- ${SPECIAL}
for cmd in "$@"
do
	${SH} -c "VAR=1; VAR=0 ${cmd}; exit \${VAR}" >/dev/null 2>&1
done

# For other built-ins and utilities they do not.
set -- ${UTILS}
for cmd in "$@"
do
	${SH} -c "VAR=0; VAR=1 ${cmd}; exit \${VAR}" >/dev/null 2>&1
done