[issue43892] Make match patterns explicit in the AST

[Pablo Galindo Salgado]

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

> I'm not really sure whether we should continue following this old tradition of int? end_* attributes for new sum types like pattern, considering that it was done for supporting the creation of old nodes 3.8< without any change on 3.8>=. pattern subclasses will only be created on 3.10>= so we should be safe by requiring end_* attributes.

Yeah, it will be a requirement very soon actually.

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