# This Unicode escape sequence that has never been in range should either
# fail to expand or expand to a fallback.

c=$(eval printf %s \$\'\\Uffffff41\' 2>/dev/null)
r=$(($? != 0))
[ "$r.$c" = '1.' ] || [ "$r.$c" = '0.?' ] || [ "$r.$c" = $'0.\u2222' ]