[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:

> Do you also exclude class and static methods?

Yup, there is a test in the PR for that IIRC

>I still worry that this might confuse users when a library for some reason uses a different name than 'self'.

That's a good point but I think it should be fine because the old error is still there and the new part is formulated as a question (did you forgot ...?). We have other errors where we are not completely sure and we formulate the suggestion as a question. Some examples are the new error for incomplete imports and some missing coma errors.

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