Memory layout benefits of inline classes

[Kasper Nielsen]

> 2. CompletableFuture: Similar to Optional, is this a candidate for
> potentially turning into an inline type?

CompletableFuture is not a candidate. If you read [1]. You will see
that instance fields of an inline class must be marked ACC_FINAL.
And CompletableFuture contains 2 volatile instance fields.

/Kasper

[1] https://cr.openjdk.java.net/~briangoetz/valhalla/sov/03-vm-model.html