gistfile1.txt

{"$2"=>
  [#<struct Token value="x", prec=0, assoc=:none>,
   #<struct Token value="+", prec=1, assoc=:left>,
   #<struct Token value="4", prec=0, assoc=:none>],
 "$1"=>
  [#<struct Token value="y", prec=0, assoc=:none>,
   #<struct Token value="/", prec=2, assoc=:left>,
   #<struct Token value="$2", prec=5, assoc=:exp>],
 "$0"=>
  [#<struct Token value="x", prec=0, assoc=:none>,
   #<struct Token value="+", prec=1, assoc=:left>,
   #<struct Token value="$1", prec=5, assoc=:exp>,
   #<struct Token value="-", prec=1, assoc=:left>,
   #<struct Token value="6", prec=0, assoc=:none>]}