[Zope-Coders] core dump in Zope 2.7 test suite

[Jeremy Hylton]

It appears this failure is reproducible, but requires that I run a whole
bunch of tests first.  I haven't narrowed it down to anything other than
"all the tests except the BDBStorage tests."

I studied the unicode implementation a bit further, and it looks like
there's trash in the unicode_freelist.  Since it doesn't fail in
isolation, I wonder if it's a bad interaction between garbage collection
and the freelist.

Jeremy