_type: ExprLambda
body:
  _type: ExprConcatStrings
  es:
    - _type: ExprConcatStrings
      es:
        - _type: ExprVar
          value: x
        - _type: ExprVar
          value: y
      isInterpolation: false
    - _type: ExprVar
      value: z
  isInterpolation: false
formals:
  x: null
  y: null
  z: null
formalsEllipsis: false