srowen commented on issue #23903: [SPARK-26977][CORE] Fix warn against subclassing scala.App URL: https://github.com/apache/spark/pull/23903#issuecomment-468102473 Heh, it's possible this just doesn't work at all. I don't think we ever envisioned people writing a `scala.App` nor is it tested. If so, it's fine to detect these cases correctly and then just fail rather than warn. Or, just remove this check; it'll fail anyway with a good error. (Or, add a note about scala.App to the exception you get)
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