Thanks Oleg my first guess is that: when working on the unsaturated type families paper, you did `cabal install --lib report`; or something similar. `report` is probably some internal library to that paper / project. I am confident I did nothing like that. But there is a file called report.cabal in the directory where I did the 'cabal install lhs2tex' command. To confirm, check what is in your ~/.ghc/x86_64-linux-8.6.5/environments/default (or similar), is some `package-id report-0.1.0.0-hexhash` line there? There is no such file:
bash$ ls ~/.ghc ghci_history x86_64-linux-8.9.0.20190414 x86_64-linux-8.9.0.20190508 x86_64-linux-8.6.4 x86_64-linux-8.9.0.20190430 x86_64-linux-8.9.0.20190527 bash$ ls ~/.ghc/x86_64-linux-8.6.4/ package.conf.d Simon From: Oleg Grenrus <oleg.gren...@iki.fi> Sent: 30 May 2019 20:19 To: Simon Peyton Jones <simo...@microsoft.com>; cabal-devel@haskell.org Subject: Re: Cabal install Hi Simon, my first guess is that: when working on the unsaturated type families paper, you did `cabal install --lib report`; or something similar. `report` is probably some internal library to that paper / project. In that case, you are hitting the unfortunate cabal bug [1]. To confirm, check what is in your ~/.ghc/x86_64-linux-8.6.5/environments/default (or similar), is some `package-id report-0.1.0.0-hexhash` line there? If so, the simplest fix is to remove that environment file. - [1] https://github.com/haskell/cabal/issues/5888 <https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fhaskell%2Fcabal%2Fissues%2F5888&data=02%7C01%7Csimonpj%40microsoft.com%7C5a4d4dc3dc214b29d8f408d6e533b91b%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636948407671672464&sdata=OH3R%2Fl9xP6d2w8OUQ8V%2FUa%2Bp%2FEpDeqyy%2FWWBxTJ7Q%2BQ%3D&reserved=0> https://github.com/haskell/cabal/issues/5559 <https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fhaskell%2Fcabal%2Fissues%2F5559&data=02%7C01%7Csimonpj%40microsoft.com%7C5a4d4dc3dc214b29d8f408d6e533b91b%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636948407671682461&sdata=%2Fo%2FL6ZWU%2Bt2fA1CDGqjHL7RU1FFHGbIJacPzLNctZyE%3D&reserved=0> Cheers, Oleg On 30.5.2019 16.50, Simon Peyton Jones wrote: Dear friendly Cabal folk Here's what happened to me today bash$ cabal install lhs2tex cabal: Could not resolve dependencies: [__0] next goal: report (user goal) [__0] rejecting: report-0.1.0.0 (conflict: requires UnsaturatedTypeFamilies) [__0] fail (backjumping, conflict set: report) After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: report Crumbs. What is 'report'? Why does it need UnsaturatedTypeFamilies? I'm totally lost. Then, in an inspired moment, I thought to change to a different directory, ~/tmp. Then quite different things happened - it downloaded and built relevant libraries. I think that there just happened to be a .cabal file in the original directory I was in at the time. That appears to affect what 'cabal install' does in a truly radical way. My point is this: this is terribly confusing for the user (at least for this on). I'd be shocked if 'apt install blah' behaved utterly differently in different directories. I'm going to make a little empty directory somewhere, and cd to it before invoking cabal in future. But that just feels like a workaround, not a solution. I'm not saying it's wrong - just giving you a data point that it had one user completely stumped Simon _______________________________________________ cabal-devel mailing list cabal-devel@haskell.org<mailto:cabal-devel@haskell.org> http://mail.haskell.org/cgi-bin/mailman/listinfo/cabal-devel<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmail.haskell.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fcabal-devel&data=02%7C01%7Csimonpj%40microsoft.com%7C5a4d4dc3dc214b29d8f408d6e533b91b%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636948407671692458&sdata=vRr6UoW69Y0U7rGrYHm1XtbAH2jlFsArh21E7i0o6ko%3D&reserved=0>
_______________________________________________ cabal-devel mailing list cabal-devel@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/cabal-devel