[ghc-steering-committee] Please review #415: OPAQUE pragma, Shepherd: Tom

Mon May 10 10:06:32 UTC 2021

Hi all,

Sorry for the delay - I’ve been moving house over the last fortnight, so I’ve been falling behind on my duties!
If I take silence to mean “no objections”, it sounds as though everyone with an opinion is in favour of this one; Joachim, are we OK to accept?

Thanks,
Tom

On 28 Apr 2021, at 19:12, Richard Eisenberg <rae at richarde.dev<mailto:rae at richarde.dev>> wrote:

I don't personally understand the details behind the motivation, but I trust the people who have supported and will throw my lot in with them.

+1 from me.

On Apr 28, 2021, at 11:08 AM, Spiwack, Arnaud <arnaud.spiwack at tweag.io<mailto:arnaud.spiwack at tweag.io>> wrote:

It occurs to me that this OPAQUE keyword may be useful for vanilla GHC as well. GHC could provide trivial implementation of some primitive functions that it defines (such as the recently discussed `withDict` function) and use the OPAQUE keyword to make sure that it can always substitute this function by its low-level implementation possibly even at the STG level if the primitive doesn't admit a Core implementation.

I don't really have a strong opinion either way, but it sounds reasonable.

On Tue, Apr 27, 2021 at 11:22 AM Tom Harding <tomjharding at live.co.uk<mailto:tomjharding at live.co.uk>> wrote:
Hi all,

I’ve read the proposal: the change is well-motivated, and seems to solve a problem that doesn’t have another pre-existing ergonomic or reliable solution.
Given this, I recommend that we accept. Alejandro and Simon have already given their support; does anyone else have any strong opinions either way?

Thanks,
Tom

On 21 Apr 2021, at 20:54, Alejandro Serrano Mena <trupill at gmail.com<mailto:trupill at gmail.com>> wrote:

That seems reasonable and with a direct application, so I’m in favor of acceptance.

Alejandro

On 21 Apr 2021 at 11:07:14, Simon Peyton Jones via ghc-steering-committee <ghc-steering-committee at haskell.org<mailto:ghc-steering-committee at haskell.org>> wrote:
Tom, I'm in support of this.  It's simple, useful, driven by a real application need, and easy to implement.  (There a small patch that does it already.)

Simon

|  -----Original Message-----
|  From: ghc-steering-committee <ghc-steering-committee-
|  bounces at haskell.org<mailto:bounces at haskell.org>> On Behalf Of Joachim Breitner
|  Sent: 21 April 2021 07:40
|  To: ghc-steering-committee <ghc-steering-committee at haskell.org<mailto:ghc-steering-committee at haskell.org>>
|  Subject: [ghc-steering-committee] Please review #415: OPAQUE pragma,
|  Shepherd: Tom
|
|  Dear Committe,
|
|  OPAQUE pragma
|  has been proposed by Christiaan Baaij
|  https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgith
|  ub.com<http://ub.com/>%2Fghc-proposals%2Fghc-
|  proposals%2Fpull%2F415&data=04%7C01%7Csimonpj%40microsoft.com<http://40microsoft.com/>%7C06
|  54777eb2f74eeff5df08d904906a19%7C72f988bf86f141af91ab2d7cd011db47%7C1%
|  7C0%7C637545841499459221%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiL
|  CJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=wm44ph5
|  Int4gqu6JKkedaAKqE0DJOcqjqK3%2BT%2BHEXcA%3D&reserved=0
|  https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgith
|  ub.com<http://ub.com/>%2Fchristiaanb%2Fghc-
|  proposals%2Fblob%2Fmaster%2Fproposals%2F0000-opaque-
|  pragma.md&data=04%7C01%7Csimonpj%40microsoft.com<http://40microsoft.com/>%7C0654777eb2f74ee
|  ff5df08d904906a19%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C6375458
|  41499459221%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMz
|  IiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=MD9R%2FGRTR8j8blj%2F
|  o2cCc6JFpbgPiGakqGkZoSoQkeg%3D&reserved=0
|
|
|  I'll propose Tom as the shepherd.
|
|  Please guide us to a conclusion as outlined in
|  https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgith
|  ub.com<http://ub.com/>%2Fghc-proposals%2Fghc-proposals%23committee-
|  process&data=04%7C01%7Csimonpj%40microsoft.com<http://40microsoft.com/>%7C0654777eb2f74eeff
|  5df08d904906a19%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637545841
|  499459221%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIi
|  LCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=VEiKysJyP4hRJ3J%2FIAQ0
|  k2t9qm7qhreZF%2FMfA31Ct1k%3D&reserved=0
|
|  Thanks,
|  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
|  oachim-
|  breitner.de<http://breitner.de/>%2F&data=04%7C01%7Csimonpj%40microsoft.com<http://40microsoft.com/>%7C0654777eb2
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|  7545841499469214%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV
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