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147f6d382c
Added some helper exceptions that invoke when a mapping based on :class:`.AbstractConcreteBase`, :class:`.DeferredReflection`, or :class:`.AutoMap` is used before the mapping is ready to be used, which contain descriptive information on the class, rather than falling through into other failure modes that are less informative. Fixes: #4470 Change-Id: I9bc51697f63cedaa7809a0adb17b2398c209e289