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Feel free to give advice about how this can be done less "hardcoded". Unfortunately, iterating over enums isn't a rust thing.

I'm not sure about making it less hardcoded, but what could be a very appreciated addition to this PR is checking for the possible values array on update_lints or on test via mem::variant_count

Unfortunately, iterating over enums isn't a rust thing.

Depending on how much we want this, this could be emulated with not too much work by wrapping the enum definition around a macro that outputs an associated const with the variant names: https://play.rust-lang.org/?version=stable&mode=debug&edition=2024&gist=11528b07df66ce90ac71c72b279887c2

I like the idea, but I'm not sure how to make define_Conf support either an array of values (good if we want to put something custom like "any type name") or a const expression.

I'm not familiar enough with update_lints to make the other suggestion in a short amount of time, so I'm going to leave it like this for now.

r? @y21 I'll let you shepherd this PR through. I like the idea, but don't have the time to do the necessary investigations/suggestions on how to make this more automated.