ellishg wrote:

> Probably would be good to introduce the `-v1` version and require it first, 
> then eventually change the default - so people don't get a silent behavior 
> change? Even the existing users only using `*` and `.` need to change their 
> syntax to migrate to v2, right? They'll need to change `.*` to `*` and `.` to 
> `?` and if they don't, their matches will start behaving strangely without a 
> specific/actionable error message?

Since `#!special-case-list-v1` is just a comment and `v1` is the default before 
this change, users can actually add it to the first line today and the behavior 
won't change until Clang 19.

https://github.com/llvm/llvm-project/pull/74809
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