#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 | Keywords: Difficulty: normal | Ghcversion: 6.10.1 Platform: | ---------------------------------+------------------------------------------ Comment(by duncan): If someone wants to fix this, the other thing to check is with and older or newer GHC that does not have two versions of base. A user reported that with ghc-6.6 they get an "impossible" internal error in this situation. The general fix here is to have a per-compiler list of packages that are impossible to upgrade. If the user explicitly asks to install one then they should get a sensible error. For all other cases it should use a constraint on picking an installed instance of these packages. -- Ticket URL: http://hackage.haskell.org/trac/hackage/ticket/597#comment:3 Hackage http://haskell.org/cabal/ Hackage: Cabal and related projects