subscriber: document Subscriber::with_test_writer() limitations
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Subscriber::with_test_writer() doesn't compose with any earlier calls of Subscriber::with_writer(), as one would perhaps hope. Rather, both just overwrite the same member. Make sure to add a note of this behavior to make it a bit more obvious.
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Subscriber::with_test_writer() doesn't compose with any earlier calls of Subscriber::with_writer(), as one would perhaps hope. Rather, both just overwrite the same member.
Make sure to add a note of this behavior to make it a bit more obvious.