#831: Strange message ---------------------------------+------------------------------------------ Reporter: Ptharien's Flame | Owner: Type: defect | Status: new Priority: normal | Milestone: Component: cabal-install tool | Version: 1.10.1.0 Severity: normal | Keywords: base, cabal, install, ghc, version, no Difficulty: unknown | Ghcversion: Platform: Mac OS | ---------------------------------+------------------------------------------ Comment(by duncan): Apparently your `base` package is broken, probably missing dependencies. Run `ghc-pkg check`. Cabal interprets broken packages as if they did not exist at all, so that's why instead of saying that base is broken, it says that it is missing. The improvement we could make here would be to add custom reasons for constraints, so that when constraints cannot be met, the associated reasons are given. Technically here we have a constraint conflict between the constraint 'must use an installed instance of base' and 'do not use base version-x.y'. What we need to do is attach a reason 'because it is broken' to the latter constraint. Then we could improve the error message. We should also say why we need base, which will be because `ObjectIO` (and everything else) depends on it. -- Ticket URL: http://hackage.haskell.org/trac/hackage/ticket/831#comment:1 Hackage http://haskell.org/cabal/ Hackage: Cabal and related projects