Tarearbol.ensure-exclamation-mark

You're seeing just the function ensure-exclamation-mark, go back to Tarearbol module for more information.
Link to this function

ensure!(job, opts \\ [])

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Specs

ensure!((() -> any()) | {atom(), atom(), list()}, keyword()) ::
  {:error, any()} | {:ok, any()}

Same as Tarearbol.ensure/2, but it raises on fail and returns the result itself on successful execution.