Word Language

  [String Lit]    str-literal   "$x"  r'[a-z]\n'  u'line\n'  b'byte \yff'
                  triple-quoted """  r'''  u'''  b'''
                  X tagged-str  "<span id=$x>"html
  [Expression]    expr-sub      echo $[42 + a[i]]
                  expr-splice   echo @[split(x)]
                  var-splice    @myarray @ARGV
  [Formatting]    X ysh-printf  ${x %.3f}
                  X ysh-format  ${x|html}
