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Miscellaneous Functions
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.. function:: fail(message)

    Throws user error with the specified message.

.. function:: fail(code, message)

    Throws user error with the specified message. Ignores 'code' argument.

.. function:: fail(json)

    Throws user error with the message specified in 'message' field of the JSON.

.. function:: fail(code, message)

    Throws user error with the message specified in 'message' field of the JSON.
    Ignores 'code' argument.