Mention in the docs for unnecessary_breaks that it's a Dart 3.0 feature

[goderbauer]

The docs for unnecessary_breaks should mention that they are enforcing a Dart 3.0 feature. The lint has no effect on code with sdk constraints lower than 3.0.0.

[parlough]

I wonder if it would make sense for rules in general to specify a required/minimum language version, at least for documentation purposes, to avoid confusion on why a lint isn't applying.

Another recent example I can think of is unnecessary_library_names which would "require" a language version of 2.19.

[pq]

100%.

We did something kind of ad_hoc w/ invalid_case_patterns but I'd love something more general.

I'd sort of imagined we could have the doc generator look at since info in the new State objects attached to lints but haven't finished the thought. 😬

In the meantime, yes, let's at least fix these up for Dart 3.0.