[ghc-steering-committee] Proposal #302: Multiway lambda: new extension or not?

Simon Peyton Jones simonpj at microsoft.com
Fri Sep 17 10:25:35 UTC 2021 

Vitaly, Tom
Are you there?  I'd love to hear from you about this.
Thanks
Simon

PS: I am leaving Microsoft at the end of November 2021, at which point simonpj at microsoft.com<mailto:simonpj at microsoft.com> will cease to work.  Use simon.peytonjones at gmail.com<mailto:simon.peytonjones at gmail.com> instead.  (For now, it just forwards to simonpj at microsoft.com.)

From: Simon Peyton Jones <simonpj at microsoft.com>
Sent: 15 September 2021 13:00
To: ghc-steering-committee at haskell.org
Cc: Simon Peyton Jones <simonpj at microsoft.com>
Subject: RE: [ghc-steering-committee] Proposal #302: Multiway lambda: new extension or not?

Vitaly, Eric, Tom, Alejandro
As Joachim says, we need to make a decision on the LambdaCase flag issue.  It's a judgement call, so let's just vote.
Here is the voting sheet<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdocs.google.com%2Fdocument%2Fd%2F1NDXk5kKcLtkqhkSNESAC9jVrBn3yqS_Qe1vacAIKnDs%2Fedit%3Fusp%3Dsharing&data=04%7C01%7Csimonpj%40microsoft.com%7Cb511339e197947e7541d08d9784067da%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637673040277542395%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=jzU6mlExltnKz2q0FPK%2Bm5wTCqXANQJMD7cmJESk85Q%3D&reserved=0>.  I have filled in votes from Simon, myself, Joacim, Richard, Vlad.  But four of us (in the to: line) have not expressed an opinion. Could you do so please, in the next day or two?  It should take you 5 minutes.
Thanks
Simon






PS: I am leaving Microsoft at the end of November 2021, at which point simonpj at microsoft.com<mailto:simonpj at microsoft.com> will cease to work.  Use simon.peytonjones at gmail.com<mailto:simon.peytonjones at gmail.com> instead.  (For now, it just forwards to simonpj at microsoft.com<mailto:simonpj at microsoft.com>.)



|  -----Original Message-----

|  From: ghc-steering-committee <ghc-steering-committee-

|  bounces at haskell.org<mailto:bounces at haskell.org>> On Behalf Of Joachim Breitner

|  Sent: 14 September 2021 08:39

|  To: ghc-steering-committee at haskell.org<mailto:ghc-steering-committee at haskell.org>

|  Subject: Re: [ghc-steering-committee] Proposal #302: Multiway lambda:

|  new extension or not?

|

|  Hi,

|

|

|  on the multiway-lambda story, we have voted to add \cases alongside

|  \case. But one open question is still: Do we

|   (1) add -XLambdaCases (which would imply -XLambdaCase) or

|   (2) simply expand the meaning of -XLambdaCase.

|

|  On the Github thread at

|  https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgith<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fghc-proposals%2Fghc-proposals%2Fpull%2F302%23issuecomment-895080031&data=04%7C01%7Csimonpj%40microsoft.com%7Cb511339e197947e7541d08d9784067da%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637673040277552385%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=UQfSypCiZZsQP%2Bu8DD%2BrWAl%2BbVysyXwYkwWJSrvdGH0%3D&reserved=0>

|  ub.com%2Fghc-proposals%2Fghc-proposals%2Fpull%2F302%23issuecomment-<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fghc-proposals%2Fghc-proposals%2Fpull%2F302%23issuecomment-895080031&data=04%7C01%7Csimonpj%40microsoft.com%7Cb511339e197947e7541d08d9784067da%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637673040277552385%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=UQfSypCiZZsQP%2Bu8DD%2BrWAl%2BbVysyXwYkwWJSrvdGH0%3D&reserved=0>

|  895080031&data=04%7C01%7Csimonpj%40microsoft.com%7Cea35a8831943459<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fghc-proposals%2Fghc-proposals%2Fpull%2F302%23issuecomment-895080031&data=04%7C01%7Csimonpj%40microsoft.com%7Cb511339e197947e7541d08d9784067da%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637673040277562383%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=Fz8Ac4%2FZsxyb%2BZTVzPf4vLUrBW2aLyWkHHVk96Kl86Q%3D&reserved=0>

|  9cce708d97752bd08%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C6376720<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fghc-proposals%2Fghc-proposals%2Fpull%2F302%23issuecomment-895080031&data=04%7C01%7Csimonpj%40microsoft.com%7Cb511339e197947e7541d08d9784067da%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637673040277572379%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=ZvWJy8VOnYChUkEu0Uz3I3i4txgrawqt06KdkKlvdts%3D&reserved=0>

|  20597687362%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMz<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fghc-proposals%2Fghc-proposals%2Fpull%2F302%23issuecomment-895080031&data=04%7C01%7Csimonpj%40microsoft.com%7Cb511339e197947e7541d08d9784067da%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637673040277582374%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=AnU0eKL8ak%2FVQXBYaGgc972ZFJQyh1wMKyFazp%2Fgg60%3D&reserved=0>

|  IiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=2ySitCA%2FT1uUznezDY<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fghc-proposals%2Fghc-proposals%2Fpull%2F302%23issuecomment-895080031&data=04%7C01%7Csimonpj%40microsoft.com%7Cb511339e197947e7541d08d9784067da%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637673040277582374%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=AnU0eKL8ak%2FVQXBYaGgc972ZFJQyh1wMKyFazp%2Fgg60%3D&reserved=0>

|  UKIO8g2ImLMKlnxm1OpKOXKZg%3D&reserved=0<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fghc-proposals%2Fghc-proposals%2Fpull%2F302%23issuecomment-895080031&data=04%7C01%7Csimonpj%40microsoft.com%7Cb511339e197947e7541d08d9784067da%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637673040277592367%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=W9Rq1zlL1DXKExX%2B2XLVl0olo74BKhF1JuelgGySimI%3D&reserved=0>

|  we see that I lean towards (1), but SPJ leands towards (2).

|

|  It doesn't matter that much, but we need to make a decision. Can I

|  please get some opinions from the rest of the committee on this point?

|

|  Cheers,

|  Joachim

|

|

|  --

|  Joachim Breitner

|    mail at joachim-breitner.de<mailto:mail at joachim-breitner.de>

|

|  https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.j<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.joachim-breitner.de%2F&data=04%7C01%7Csimonpj%40microsoft.com%7Cb511339e197947e7541d08d9784067da%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637673040277602365%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=Dlo%2FKTIzbaLYOyi0%2F0rk9U7ZXoRpCMg7TQrq4g7vj9E%3D&reserved=0>

|  oachim-<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.joachim-breitner.de%2F&data=04%7C01%7Csimonpj%40microsoft.com%7Cb511339e197947e7541d08d9784067da%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637673040277602365%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=Dlo%2FKTIzbaLYOyi0%2F0rk9U7ZXoRpCMg7TQrq4g7vj9E%3D&reserved=0>

|  breitner.de%2F&data=04%7C01%7Csimonpj%40microsoft.com%7Cea35a88319<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.joachim-breitner.de%2F&data=04%7C01%7Csimonpj%40microsoft.com%7Cb511339e197947e7541d08d9784067da%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637673040277612365%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=raBLXrB3GJ2oSrmIysrHs0X%2FtzPlt3hojkvp6v3lVdU%3D&reserved=0>

|  434599cce708d97752bd08%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C63<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.joachim-breitner.de%2F&data=04%7C01%7Csimonpj%40microsoft.com%7Cb511339e197947e7541d08d9784067da%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637673040277622356%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=8gwNMFe4MOayMSiczhBy16AvhKiaq7TY%2BuWcNjoAr%2FQ%3D&reserved=0>

|  7672020597697367%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.joachim-breitner.de%2F&data=04%7C01%7Csimonpj%40microsoft.com%7Cb511339e197947e7541d08d9784067da%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637673040277622356%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=8gwNMFe4MOayMSiczhBy16AvhKiaq7TY%2BuWcNjoAr%2FQ%3D&reserved=0>

|  2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=unmdYu9zUy00ec4<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.joachim-breitner.de%2F&data=04%7C01%7Csimonpj%40microsoft.com%7Cb511339e197947e7541d08d9784067da%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637673040277632352%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=dNhxQH7oR41rjrD7USKU%2F2Rhm%2Bo2qnQFoKdi3WjoqIc%3D&reserved=0>

|  21KJYmL9I2ZO%2BlIx5J9cLw27GnmI%3D&reserved=0<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.joachim-breitner.de%2F&data=04%7C01%7Csimonpj%40microsoft.com%7Cb511339e197947e7541d08d9784067da%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637673040277642348%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=UrzlZdQeq29XEiWbdAeQH%2BGi4%2BpOIqka6IeJ%2BAuJ9qc%3D&reserved=0>

|

|

|  _______________________________________________

|  ghc-steering-committee mailing list

|  ghc-steering-committee at haskell.org<mailto:ghc-steering-committee at haskell.org>

|  https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmail<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmail.haskell.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fghc-steering-committee&data=04%7C01%7Csimonpj%40microsoft.com%7Cb511339e197947e7541d08d9784067da%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637673040277652345%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=ZNSPu2k360KVWAJ9poqlO56owNYi5pxCS8P6vvEpyUE%3D&reserved=0>

|  .haskell.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fghc-steering-<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmail.haskell.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fghc-steering-committee&data=04%7C01%7Csimonpj%40microsoft.com%7Cb511339e197947e7541d08d9784067da%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637673040277652345%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=ZNSPu2k360KVWAJ9poqlO56owNYi5pxCS8P6vvEpyUE%3D&reserved=0>

|  committee&data=04%7C01%7Csimonpj%40microsoft.com%7Cea35a8831943459<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmail.haskell.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fghc-steering-committee&data=04%7C01%7Csimonpj%40microsoft.com%7Cb511339e197947e7541d08d9784067da%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637673040277662342%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=LSFYEN4qQBFd7t4o2CGuEyjUibTaZvdjDgzunCNl2YU%3D&reserved=0>

|  9cce708d97752bd08%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C6376720<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmail.haskell.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fghc-steering-committee&data=04%7C01%7Csimonpj%40microsoft.com%7Cb511339e197947e7541d08d9784067da%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637673040277672335%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=1QJDcC8pGcNlNNpUkLZ%2B%2FTjLeDpXPCf7sIDI0%2FtT1FU%3D&reserved=0>

|  20597697367%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMz<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmail.haskell.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fghc-steering-committee&data=04%7C01%7Csimonpj%40microsoft.com%7Cb511339e197947e7541d08d9784067da%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637673040277672335%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=1QJDcC8pGcNlNNpUkLZ%2B%2FTjLeDpXPCf7sIDI0%2FtT1FU%3D&reserved=0>

|  IiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=TG3t%2Fw1kFLk173SoM5<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmail.haskell.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fghc-steering-committee&data=04%7C01%7Csimonpj%40microsoft.com%7Cb511339e197947e7541d08d9784067da%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637673040277682330%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=87FhXp16tqtDe3%2BB099uId0JRDBhSf5uaxKC9Lg%2Bh%2BQ%3D&reserved=0>

|  soHU39BlAPv76TY%2B9FNetaLJs%3D&reserved=0<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmail.haskell.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fghc-steering-committee&data=04%7C01%7Csimonpj%40microsoft.com%7Cb511339e197947e7541d08d9784067da%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637673040277692329%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=olFbP%2BA3I3L4lBZxAcO%2FGPS8LqhCBamQC6oo0560lEg%3D&reserved=0>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.haskell.org/pipermail/ghc-steering-committee/attachments/20210917/395e45a8/attachment-0001.html>

More information about the ghc-steering-committee mailing list