[issue33138] Improve standard error for uncopyable types

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Changed to "cannot pickle 'XXX' object" after discussing on Python-Dev:

https://mail.python.org/pipermail/python-dev/2018-October/155599.html

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33138>
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