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

[Pablo Galindo Salgado]

Pablo Galindo Salgado <pablogsal at gmail.com> added the comment:

> Seems that that guess will be wrong in most cases.

Maybe I am missing something. Could you list some cases where this will give the wrong advice?

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