if [ "$1" != nested ]; then
	f() {
		set -- nested
		. "$0"
		# Allow return to return from the function or the dot script.
		return 4
	}
	f
	exit $(($? ^ 4))
fi
# To trigger the bug, the following commands must be at the top level,
# with newlines in between.
return 4
echo bad
exit 1