instance_eval causes ensure to execute before rescue

[jbreeden]

If I raise an exception with a simple raise expression, all is well. However, if I raise from an instance_eval the ensure clause is executed before the rescue clause. This is demonstrated below.

class HellRaiser
  def raise_hell
    order = [:enter_raise_hell]
    begin
      order.push :begin
      raise 'error'
    rescue
      order.push :rescue
    ensure
      order.push :ensure
    end
    order
  end
end

hell_raiser = HellRaiser.new
hell_raiser.raise_hell
#=> [:enter_raise_hell, :begin, :rescue, :ensure]

class HellRaiser
  def raise_hell
    order = [:enter_raise_hell]
    begin
      order.push :begin
      self.instance_eval("raise 'error'")
    rescue
      order.push :rescue
    ensure
      order.push :ensure
    end
    order
  end
end

hell_raiser = HellRaiser.new
hell_raiser.raise_hell
#=> [:enter_raise_hell, :begin, :ensure, :rescue]

[0x1eef]

@jbreeden I like your choice of class & method name :)