Nicholas Nethercote writes:

> Do warnings (as opposed to NS_ASSERTION) do anything in tests? I don't
> think they do. If that's right, a warning is only useful if a human
> looks at it and acts on it, and that's clearly not happening for a lot
> of these.

Warnings in tests don't do anything but log that a problem has
occurred.

But, when the warnings are not noisy, this is often useful for
tracking the cause of intermittent failures.

Similarly, warnings about real problems are helpful when running
debug builds, but we are being spammed with so many warnings that
it is hard to imagine they can all be real problems.  If they are,
then we are doing a poor job of keeping up with them.
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