Reviewing feedback on patterns in switch

Remi Forax forax at
Fri Jan 28 12:40:49 UTC 2022

----- Original Message -----
> From: "mark" <mark at>
> To: "Brian Goetz" <brian.goetz at>
> Cc: "amber-spec-experts" <amber-spec-experts at>
> Sent: Friday, January 28, 2022 12:43:55 PM
> Subject: Re: Reviewing feedback on patterns in switch

> On 2022-01-25T19:46:09 +0000
> Brian Goetz <brian.goetz at> wrote:
>> We’ve previewed patterns in switch for two rounds, and have received some
>> feedback.  Overall, things work quite well, but there were a few items which
>> received some nontrivial feedback, and I’m prepared to suggest some changes
>> based on them.  I’ll summarize them here and create a new thread for each with
>> a more detailed description.
>> I’ll make a call for additional items a little later; for now, let’s focus on
>> these items before adding new things (or reopening old ones.)
>> 1.  Treatment of total patterns in switch / instanceof
>> 2.  Positioning of guards
>> 3.  Type refinements for GADTs
>> 4.  Diamond for type patterns (and record patterns)
> Hello!
> I'm a little late to the party, as ever, but is there a specific build I
> should be looking at so that I can get a better idea of what the current
> state of things are?

Hi Mark,
the last jdk18 build or any new jdk19 builds will do.

> --
> Mark Raynsford |


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