Dear Committee,

I encourage you to take a look at Trevis' proposal to categorise the
stability of more language extensions, by amending the existing
categorization in proposal #669:

https://github.com/ghc-proposals/ghc-proposals/pull/738

I think we should accept this in principle. However, this proposal is
somewhat atypical as it consists of many small decisions about
individual extensions. Thus I suggest it may be easiest to comment on
specific lines of the MR and discuss any changes there. Once more people
have opined on the categorization, we can confirm whether there is
consensus to accept.

When reviewing, please bear in mind the definitions of the categories as
set out in proposal #601
(https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0601-extension-lifecycle-framework.md#21-categories).
Note in particular that use of Deprecated extensions should result in
warnings, and that declaring an extension Stable implies that it is
highly unlikely to be subject to breaking changes.

Cheers,

Adam




On 24/07/2026 11:02, Simon Marlow wrote:
> Trevis Elser submitted proposal #738:
>
> Amend #669 to categorize more language extensions <https://github.com/
> ghc-proposals/ghc-proposals/pull/738>
>
> for the committee to review.
>
> I'd like to nominate *Adam Gundry* as the shepherd.
>
> Please guide us to a conclusion as outlined in the committee processes
> <https://github.com/ghc-proposals/ghc-proposals/blob/master/
> README.rst#9committee-process-for-responding-to-a-proposal>.
>
> If possible, please aim to make a recommendation by *7 August 2026*.
>
> Cheers
> Simon



--
Adam Gundry, Haskell Consultant
Well-Typed LLP, https://www.well-typed.com/

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