RFR: 8282823: javac should constrain more uses of preview APIs

[Jim Laskey]

On Thu, 10 Mar 2022 12:28:27 GMT, Jan Lahoda <jlahoda at openjdk.org> wrote:

> Consider a class or interface with a method marked as preview. Subclassing the class or implementing the interface by itself should not cause a preview error/warning (as that would be problematic for Loom), but overriding the method should produce a preview error/warning.
> 
> This patch adds the error/warning in case a preview method is overridden.

LGTM

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Marked as reviewed by jlaskey (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/7774