On Wed, 8 Jun 2022 15:46:24 GMT, Paul Sandoz <psan...@openjdk.org> wrote:

> Allow JDK modules that use preview features (preview language features or 
> preview API features from dependent modules) to participate without the need 
> to compile with `--enable-preview`.
> It's difficult to enable participation using an annotation due to the nature 
> in which symbols are encountered when processing source as there is no 
> guaranteed order to the processing of certain symbols.
> Instead a JDK module participates if the `java.base` package 
> `jdk.internal.javac` is exported to that module (@lahodaj clever idea!). An 
> internal annotation `jdk.internal.javac.ParticipatesInPreview` can be 
> declared on the module. Such a declaration cannot be enforced but does by its 
> use require the `jdk.internal.javac`'s export list to be updated.
> The modules `jdk.incubator.vector` and `jdk.incubator.concurrent` have been 
> updated accordingly, both of which participate in preview APIs (APIs in 
> `java.lang.foreign` and `Thread.ofVirtual`, respectively).

This pull request has now been integrated.

Changeset: fb297705
Author:    Paul Sandoz <psan...@openjdk.org>
Stats:     140 lines in 12 files changed: 65 ins; 57 del; 18 mod

8287186: JDK modules participating in preview

Reviewed-by: alanb, jlahoda


PR: https://git.openjdk.org/jdk/pull/9087

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