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  1. or download this
    expr : expr expr binop
       { [ BINOP => [ $item[3], $item[1], $item[2] ] ] }

     | term
  2. or download this
    expr  : term { push($item[1]) } expr_

...

expr_ : expr binop
        { [ BINOP => [ $item[2], pop(), $item[1] ] ] }
  3. or download this
    expr   : term { push($item[1]) } expr_1

...

expr_2 : expr binop
         { [ BINOP => [ $item[2], pop(), $item[1] ] ] }
  4. or download this
    expr  : term { push($item[1]) } expr_

...

      | # Automatic match
         { pop() }