GHC 8.10 backports?

[Moritz Angermann]

The commit message from
https://gitlab.haskell.org/ghc/ghc/-/commit/f10d11fa49fa9a7a506c4fdbdf86521c2a8d3495
,
makes the changes to string seem required. Applying the commit on its own
doesn't apply cleanly and pulls in quite a
bit of extra dependent commits. Just applying the elem rules appears rather
risky. Thus will I agree that having that
would be a nice fix to have, the amount of necessary code changes makes me
rather uncomfortable for a minor release :-/

On Mon, Mar 22, 2021 at 1:58 PM Gergő Érdi <gergo at erdi.hu> wrote:

> Thanks, that makes it less appealing. In the original thread, I got no
> further replies after my email announcing my "discovery" of that commit, so
> I thought that was the whole story.
>
> On Mon, Mar 22, 2021, 13:53 Viktor Dukhovni <ietf-dane at dukhovni.org>
> wrote:
>
>> On Mon, Mar 22, 2021 at 12:39:28PM +0800, Gergő Érdi wrote:
>>
>> > I'd love to have this in a GHC 8.10 release:
>> > https://mail.haskell.org/pipermail/ghc-devs/2021-March/019629.html
>>
>> This is already in 9.0, 9.2 and master, but it is a rather non-trivial
>> change, given all the new work that went into the String case.  So I am
>> not sure it is small/simple enough to make for a compelling backport.
>>
>> There's a lot of recent activity in this space.  See also
>> <https://gitlab.haskell.org/ghc/ghc/-/merge_requests/5259>, which is not
>> yet merged into master, and might still be eta-reduced one more step).
>>
>> I don't know whether such optimisation tweaks (not a bugfix) are in
>> scope for backporting, we certainly need to be confident they'll not
>> cause any new problems.  FWIW, 5259 is dramatically simpler...
>>
>> Of course we also have
>> <https://gitlab.haskell.org/ghc/ghc/-/merge_requests/4890> in much the
>> same territory, but there we're still blocked on someone figuring out
>> what's going on with the 20% compile-time hit with T13056, and whether
>> that's acceptable or not...
>>
>> --
>>     Viktor.
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