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Adding information to custom exceptions

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It may be helpful to include additional information with an exception, e.g. for logging purposes or to allow conditional handling when the exception is caught: 

class CustomError < StandardError
  attr_reader :safe_to_retry

  def initialize(safe_to_retry = false, message = 'Something went wrong')
    @safe_to_retry = safe_to_retry
    super(message)
  end
end

Raising the exception: 

raise CustomError.new(true)

Catching the exception and accessing the additional information provided: 

begin
  # do stuff
rescue CustomError => e
  retry if e.safe_to_retry
end
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Exceptions:
*Exceptions
*Creating a custom exception type
*Handling multiple exceptions
*Handling an exception
*Raising an exception
*Adding information to custom exceptions
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