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2021-04-15 21:27:39 michalz parts (~user@185.246.204.44) ("Changed major mode")
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2021-04-15 21:28:13 <maerwald> Philonous: what problems have you seen when using stackage with cabal?
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2021-04-15 21:28:58 <maerwald> I have done so myself with relatively high success... the problem is only converting the snapshot and the stack configuration correctly
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2021-04-15 21:29:35 <maerwald> @hackage stack2cabal
2021-04-15 21:29:36 <lambdabot> https://hackage.haskell.org/package/stack2cabal
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2021-04-15 21:37:58 <maerwald> the other problem is that it's hard to manually tell cabal which revision of a package you want
2021-04-15 21:38:10 <maerwald> you can only do so implicitly via the index state
2021-04-15 21:39:02 <sclv> i know its not perfect, but ideally one would always want the latest revision (if this isn't true, the revision was done weirdly/wrongly)
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2021-04-15 21:44:20 <maerwald> sclv: not necessarily
2021-04-15 21:44:31 <maerwald> some revisions break build plans
2021-04-15 21:44:42 <sclv> right but they shouldn't
2021-04-15 21:44:48 <sclv> they should only rule out invalid builds
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2021-04-15 21:46:31 <maerwald> I forgot why that doesn't work, I think because you can't have build plans per GHC version
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2021-04-15 21:47:13 <sclv> you can often use base as a proxy
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2021-04-15 21:48:19 <maerwald> I'm aware of the GHC-base relationship
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2021-04-15 21:50:16 <Philonous> @maerwald, You can download the stackage snaptshot as a cabal.confg directly, e.g. https://www.stackage.org/lts-17.9/cabal.config
2021-04-15 21:50:16 <lambdabot> Unknown command, try @list
2021-04-15 21:50:26 <Philonous> Oops
2021-04-15 21:50:36 <maerwald> sclv: https://github.com/ekmett/contravariant/issues/61
2021-04-15 21:50:38 <Philonous> But as the file says, that sometimes fails because of revisions
2021-04-15 21:50:48 <maerwald> Philonous: stack2cabal does a better job at that
2021-04-15 21:51:05 <maerwald> sclv: "However, when I actually did bump these version bounds, I discovered that contravariant fails to build with StateVar-1.2 on old GHCs due to changes in Safe Haskell behavior. See here for an example of the error that occurred."
2021-04-15 21:51:12 <Philonous> Ah, I didn't know about that tool. Maybe that would be the best of both worlds then
2021-04-15 21:51:23 <maerwald> so they changed an upper bound, because of failures of an old GHC version
2021-04-15 21:51:44 <maerwald> you can't specify upper bounds depending on GHC versions
2021-04-15 21:52:26 <maerwald> either you drop the old GHC version as unsupported, or you revert something that works for *some* GHC versions
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2021-04-15 21:52:51 <maerwald> and those who had a valid build plan now have a solver error
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2021-04-15 21:53:31 <maerwald> but not sure that's something relevant for stackage, since it's allow-newer anyway
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