let x = "world"
let a = "hello $x out there"
let seq = [2 4]
echo "hello $x and @seq[0] there"
echo "$x and $$y there"
echo "$x ==> @s[ with errors"
echo "$22 @"
echo "start @22$x end@@"
echo "a@"
echo "a@a["
echo "xx${aa}cc${bbb}dd"
echo "${bbb"
echo "${bbb@aa@{hh${c}@z world"
echo "==${array[2..2]}${first[2..2]@{two[2]}${four}"
echo "\$aa\@aaccc"
