#597: non-exhaustive patterns when trying to install base ---------------------------------+------------------------------------------ Reporter: guest | Owner: Type: defect | Status: new Priority: normal | Milestone: Component: cabal-install tool | Version: 1.6.0.2 Severity: minor | Resolution: Keywords: | Difficulty: normal Ghcversion: 6.10.1 | Platform: ---------------------------------+------------------------------------------ Changes (by duncan): * difficulty: unknown => normal * summary: non-exhaustive patterns in lambda => non-exhaustive patterns when trying to install base * severity: normal => minor * platform: Mac OS => Comment: The key bit is: {{{ $ cabal install base Resolving dependencies... cabal: Distribution/Client/Dependency/TopDown.hs:170:37-73: Non-exhaustive patterns in lambda }}} Yep, trying to install base will not work. We should produce a better error message though. As for the other bits, your getting confused about the error messages. The message you get when the profiled version is missing is different. The regex-dfa-0.91 package really is from the ghc-6.6 era and is missing the dependency on the containers package. The problem when you build containers is that the package does not specify the version of base that it needs. It needs version 4 but does not say so, and by default cabal will pick base 3, because that's the choice that makes all the older stuff work. But as I say, you've got the profiled version of containers already, so don't re-install it. -- Ticket URL: http://hackage.haskell.org/trac/hackage/ticket/597#comment:1 Hackage http://haskell.org/cabal/ Hackage: Cabal and related projects