exec pint parse 'bar + fill_right(0) baz'
cmp stdout stdout.txt
! stderr .

-- stdout.txt --
++ node: bar + fill_right (0) baz
  BinaryExpr:
    * Type: vector
    * Op: +
    * LHS: bar
    * RHS: baz
    * VectorMatching:
      * Card: one-to-one
      * MatchingLabels: []
      * On: false
      * Include: []
      * FillRHS: 0
    * ReturnBool: false
      ++ node: bar
        VectorSelector:
          * Type: vector
          * Name: bar
          * Offset: 0s
          * LabelMatchers: [__name__="bar"]
      ++ node: baz
        VectorSelector:
          * Type: vector
          * Name: baz
          * Offset: 0s
          * LabelMatchers: [__name__="baz"]
