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どうしてもbacktraceが必要なあなたへ

Posted at

任意のその場でインスタンス化したExceptionにbacktrace情報やcauseを付与したい時がある。そんなときはこう。

begin
  1/0
rescue => e
  err = raise RuntimeError.new, '任意のエラーを発生させよう!' rescue $!
  p err
  p err.cause
end
# => #<RuntimeError: 任意のエラーを発生させよう!>
# => #<ZeroDivisionError: divided by 0>

これが一番早いと思います

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