RFR: JDK-8329624: Add visitors for preview language features

[Alan Bateman]

On Wed, 3 Apr 2024 20:17:39 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> When new language features are added, the javax.lang.model may need to be updated. For certain classes of features, the API update includes introducing a new set of concrete visitors to handle the language feature.
> 
> The API scaffolding to support the new feature tends to be considerably larger than the API specifically for the new feature.
> 
> To aid work in progress (such as https://github.com/openjdk/jdk/pull/18509) and anticipated in the future, I think it would be helpful to introduce a persistent set of preview visitors independent of any particular language change.

The visitor classes are themselves preview APIs. Is this the first time that preview APIs have been proposed without a JEP? Just wondering how much visibility this preview API will get.

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PR Comment: https://git.openjdk.org/jdk/pull/18609#issuecomment-2036238254