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Currently Haskell98 and Haskell2010 are a special kind of LANGUAGE option that can't be reversed, and later ones override earlier ones. I think we should treat GHC2021 in the same way.<o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Fine with me. I’d just like to see it specified in the proposal.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Simon<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> ghc-steering-committee <ghc-steering-committee-bounces@haskell.org>
<b>On Behalf Of </b>Simon Marlow<br>
<b>Sent:</b> 18 January 2021 15:01<br>
<b>To:</b> Joachim Breitner <mail@joachim-breitner.de><br>
<b>Cc:</b> ghc-steering-committee <ghc-steering-committee@haskell.org><br>
<b>Subject:</b> Re: [ghc-steering-committee] #380 GHC2021: How to proceed?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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On Mon, 18 Jan 2021 at 11:08, Joachim Breitner <<a href="mailto:mail@joachim-breitner.de">mail@joachim-breitner.de</a>> wrote:<o:p></o:p></p>
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<br>
<br>
> Is there `-XNoGHC2021`, and if so what does it do? Proposal should say.<br>
<br>
The meta-proposal says<br>
<br>
This language version can be used as a language extension (with the<br>
sole effect of implying other language extensions), but also as a<br>
language versions in places where Haskell98 or Haskell2010 is valid<br>
(e.g. via Cabal’s default-language field).<br>
<br>
When ghc is used without an explicit language choice, the latest<br>
GHC20xx known to GHC is used. This applies in particular to uses of<br>
ghci.<br>
<br>
and I’d hope that this answers such technical details (and that the GHC<br>
devs will resolve obscure corner cases sensibly)?<br>
<br>
It seems that ghc-8.8 does not know -XNoHaskell2010, so I would assume<br>
that there is no -XNoHaskell2010 either. If there is a nice use case<br>
for that, I think adding this a feature doesn't need committee<br>
involvement, and can be done by GHC contributers.<o:p></o:p></p>
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<o:p> </o:p></p>
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Currently Haskell98 and Haskell2010 are a special kind of LANGUAGE option that can't be reversed, and later ones override earlier ones. I think we should treat GHC2021 in the same way.<o:p></o:p></p>
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<o:p></o:p></p>
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Relatedly, at least one community member asked for a way to opt-into<br>
the current “default” mode of GHC (which is neither Haskell98 nor<br>
Haskell2010, e.g. it has NondecreasingIndentation).<br>
He suggested simply calling that GHC2020. Whether that happens, and if<br>
it’s called GHC2020 or OldDefault or something else, I’d also trust the<br>
GHC devs.<o:p></o:p></p>
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<o:p> </o:p></p>
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GHC2020 seems reasonable to me.<o:p></o:p></p>
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<o:p> </o:p></p>
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Cheers<o:p></o:p></p>
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Simon<o:p></o:p></p>
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<o:p></o:p></p>
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<br>
<br>
Cheers,<br>
Joachim<br>
<br>
<br>
-- <br>
Joachim Breitner<br>
<a href="mailto:mail@joachim-breitner.de" target="_blank">mail@joachim-breitner.de</a><br>
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<br>
<br>
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