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instantiated, and the package it was overriding already had a
``__loader__`` attribute, it would fail at startup time, even if the
``__loader__`` attribute was another PackageOverrides instance. We
now replace any ``__loader__`` that is also a PackageOverrides
instance. Symptom: ``ConfigurationExecutionError: <type
'exceptions.TypeError'>: Package <module 'karl.views' from
'/Users/chrism/projects/osi/bfgenv/src/karl/karl/views/__init__.pyc'>
already has a __loader__ (probably a module in a zipped egg)``.
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