[GHC] #14490: TTG Snags

Simon Peyton Jones simonpj at microsoft.com
Thu Nov 23 23:13:26 UTC 2017


Yes, but it is not feasible before GHC 8.6, due to needing GHC >= 8.2 for bootstrapping.
True.  But 8.4 will fork off shortly; so once that is done, we are happy with perf, we can add the change to master in preparation for 8.6.

Simon

From: ghc-devs [mailto:ghc-devs-bounces at haskell.org] On Behalf Of Alan & Kim Zimmerman
Sent: 22 November 2017 13:30
To: ghc-devs at haskell.org
Subject: Re: [GHC] #14490: TTG Snags

Yes, but it is not feasible before GHC 8.6, due to needing GHC >= 8.2 for bootstrapping.


On 22 November 2017 at 15:26, GHC <ghc-devs at haskell.org<mailto:ghc-devs at haskell.org>> wrote:
#14490: TTG Snags
-------------------------------------+-------------------------------------
        Reporter:  alanz             |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14482            |  Differential Rev(s):
       Wiki Page:                    |
  ImplementingTreesThatGrow          |
-------------------------------------+-------------------------------------

Comment (by Shayan-Najd):

 > So making a Data instance per concrete version may be the best way to
 go. Plan B.

 Regardless of the GHC version we use, the question is whether Plan B
 really fixes the build-time problem. Can we test it?

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14490#comment:31<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fghc.haskell.org%2Ftrac%2Fghc%2Fticket%2F14490%23comment%3A31&data=02%7C01%7Csimonpj%40microsoft.com%7C3556984203554207d6c008d531ad467b%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636469542646255358&sdata=s6kHeirmxaeW%2BRTX%2BPLHZl6UriqamOJcUlofDk5UogM%3D&reserved=0>>
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