_type: ExprLet
attrs:
  const:
    _type: ExprLambda
    arg: a
    body:
      _type: ExprString
      value: const
body:
  _type: ExprConcatStrings
  es:
    - _type: ExprCall
      args:
        - _type: ExprSet
          attrs:
            x:
              _type: ExprString
              value: q
          recursive: false
      fun:
        _type: ExprVar
        value: const
  forceString: true