[issue42978] Improve error message when "self" is missing from the method definition

[Serhiy Storchaka]

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

Concur with Guido. Seems that that guess will be wrong in most cases.

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nosy: +serhiy.storchaka

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42978>
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