Re: [ghc-steering-committee] Proposal #608, -XPatternSignatureBinds. Rec: accept

I'm not sure I understand Arnaud's question here: this proposal removes the binding capability from -XPatternSignatures. I don't think there's an interaction with -XTypeAbstractions. On Fri, Jan 26, 2024 at 3:04 AM Arnaud Spiwack wrote:

Do we envision, maybe, a future with `-XPatternSignature`, in a version that is incapable of binding and `-XTypeAbstractions`? If so, the split sounds like a reasonable move. Otherwise, the benefit of the split sounds rather slim, and it would need to be weighed against the costs and benefits on the implementation.

On Thu, 25 Jan 2024 at 07:07, Moritz Angermann wrote:

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As this is guarded behind a language extension and as such should not impact any existing code. I'm happy to see this change.

On Thu, 25 Jan 2024 at 04:43, Adam Gundry wrote:

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I'm also happily in favour, for the reason Joachim articulates.

Adam

On 24/01/2024 18:24, Joachim Breitner wrote:

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Hi,

Am Mittwoch, dem 24.01.2024 um 17:32 +0000 schrieb Richard Eisenberg:

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- Accepting will make at least one person (John) happy. And I don't note anyone who would become unhappy. More happy people is more better. So I recommend acceptance. :)

unless I am mistaken, this proposal will also un-deprecated -XPatternSignatures, and give it the semantics I asked for in #119: allow me to write

foo :: Monad m => m Int foo = do list :: String <- return "" return $ length list

without treading into type variable territory, having to turn on ScopedTypeVariables or anything like that. Finally!

So it also makes me a bit happy; in favor.

Cheers, Joachim

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

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-- Arnaud Spiwack Director, Research at https://moduscreate.com and https://tweag.io. _______________________________________________ ghc-steering-committee mailing list ghc-steering-committee@haskell.org https://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-steering-committee