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Companion objects (and thus also case classes) in package objects caused
an assert about an overloaded symbol when everything was compiled twice.
It's a hairy problem that doesn't fit in 2.10.1. So this fix adds an
implementation restriction. It also has a test to make sure the error
messages are clean and reasonably friendly, and does not catch other
things defined in package objects. The test includes a
commented out test in case somebody thinks they've solved the underlying
problem.
A handful of tests were falling afoul of the new implementation
restriction. I verified that they do in fact fail on second compile so
they aren't false casualties. But they do test real things we'd like
to work once the re-compile issue is fixed. So I added a -X flag to
disable the implementation restriction and made all the tests
accidentally clobbered by the restriction use that flag.
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