[issue5420] Queue deprecation warning patch

[Jean-Paul Calderone]

Jean-Paul Calderone <exarkun at divmod.com> added the comment:

Unit tests are a great thing as well.  Also, the deprecation warnings
you've added are the really annoying kind.  They refer to users to the
source of the deprecated methods themselves!  A vastly preferable use of
the warnings system is to refer users to the *callers* of the deprecated
methods.  Try passing different values for the stacklevel parameter of
the warnings.warn function until you get a warning that is more helpful.

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nosy: +exarkun

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