On Sat, 2008-06-07 at 09:36 -0700, Thomas Hartman wrote:

cabal issue?

Yes and no. What is happening is that there are several versions of the Cabal library installed. In particular Cabal-1.3.12 and Cabal-1.5.2. The happy package uses build-type Custom so cabal-install compiles the Setup.lhs script. The question is what version of the Cabal library should it use? The happy.cabal file specifies cabal-version: >= 1.2 so we'd better respect that. But even then we have several choices. Currently it just picks the highest one of the remaining choices. In this case that meant Cabal-1.5.2 -- the latest development version. This version turns out to have API changes that means that we get a type error when compiling Setup.lhs. As it happens, if cabal-install had picked one of the other choices then it would have compiled ok because the 1.2.x and upcoming 1.4.x series do not have those api changes. The immediate workarounds are: * unregister Cabal-1.5.2 * cabal install happy --cabal-lib-version 1.3.12 Perhaps a better solution is for cabal-install to choose the version of the Cabal library differently. Of course it has to be within the hard constraints specified in the .cabal file and on the command line. But after that perhaps it should prefer the version of the Cabal library that it itself was built with and at second preference the latest version in the same major series. The last preference would be as now, the latest version available. Sound sensible? Duncan

---------- Forwarded message ---------- From: Thomas Hartman Date: 2008/6/7 Subject: installing happy 1.17 To: haskell

I had a problem installing happy 1.17 (same result with happy head). This appears to be required for installing happs-hsp-template via cabal install.

thanks for any advice!

Thomas.

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thartman@thartman-laptop:~/haskellInstalls/smallInstalls>darcs get --partial http://darcs.haskell.org/happy/ ********************** Copying patch 87 of 87... done. Applying patch 86 of 86... done. Finished getting.

thartman@thartman-laptop:~/haskellInstalls/smallInstalls>cd happy

thartman@thartman-laptop:~/haskellInstalls/smallInstalls/happy>runghc Setup.lhs configure

Setup.lhs:30:43: Not in scope: `buildVerbose' thartman@thartman-laptop:~/haskellInstalls/smallInstalls/happy>cabal --version cabal-install version 0.4.9 using version 1.3.12 of the Cabal library thartman@thartman-laptop:~/haskellInstalls/smallInstalls/happy>ghc-pkg list | grep -i cabal Cabal-1.2.3.0, Cabal-1.3.11, Cabal-1.3.12, Cabal-1.5.2,