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

26 Jan 2024


      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:
...
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:
...
I'm also happily in favour, for the reason Joachim articulates.
Adam
On 24/01/2024 18:24, Joachim Breitner wrote:
...
Hi,
Am Mittwoch, dem 24.01.2024 um 17:32 +0000 schrieb Richard Eisenberg:
...
- 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
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