class Predicate
  module Native
    include Expr

    def priority
      90
    end

    def proc
      self[1]
    end

    def to_ruby_code(scope = 't')
      if proc.respond_to?(:source_code)
        code = proc.source_code
        return code if code
      end
      raise NotSupportedError
    end

    def to_proc(scope = 't')
      proc
    end

    def free_variables
      raise NotSupportedError
    end

  end
end