<i18n dev> RFR: 8366178: Implement JEP 526: Lazy Constants (Second Preview) [v2]

[ExE Boss]

On Mon, 13 Oct 2025 13:54:44 GMT, Per Minborg <pminborg at openjdk.org> wrote:

>> Implement JEP 526: Lazy Constants (Second Preview)
>> 
>> The lazy list/map implementations are broken out from `ImmutableCollections` to a separate class.
>> 
>> The old benchmarks are not moved/renamed to allow comparison with previous releases.
>> 
>> `java.util.Optional` is updated so that its field is annotated with `@Stable`.  This is to allow `Optional` instances to be held in lazy constants and still provide constant folding.
>
> Per Minborg has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove redundant field

src/java.base/share/classes/java/util/AbstractMap.java line 335:

> 333:      */
> 334:     @Stable
> 335:     transient Set<K>        keySet;

Are all uses of this field in `java.util` able to handle the `@Stable`ness of this field correctly?

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PR Review Comment: https://git.openjdk.org/jdk/pull/27605#discussion_r2426844190