package_context:
  valid:
    - | # param, variable binding, and rule block
      param $X := 1
      $Y := true
      
      Rule Test
        input '*.txt'
        output '{$*}.result'
      Action
        rev {$I[1]} > {$O[1]}
      End
    - | # param block, rule block, and rule binding
      Param
        $X := 1
        $Y := 2
        $Z := 3
      End

      Rule Test
        input '*.txt'
        output '{$*}.result'
        param $A := 1
      Action
        rev {$I[1]} > {$O[1]}
      End

      rule Test2 := Test