[issue42630] Variable.__init__ raise a RuntimeError instead of obscure AttributeError

[Ivo Shipkaliev]

Ivo Shipkaliev <ivo.shipkaliev at gmail.com> added the comment:

https://mail.python.org/archives/list/python-ideas@python.org/thread/FSQUFJJQDNSRN4HI7VFXWCNO46YLXQDS/

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42630>
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