Djinn Doesn't Build
dominic.steinitz at blueyonder.co.uk
Sun Feb 8 13:08:33 EST 2009
Duncan Coutts wrote:
> On Sun, 2009-02-08 at 07:41 +0000, Dominic Steinitz wrote:
>>> dom at linux-6ofq:~/djinn-2009.2.1> runghc Setup.lhs build
>>> Preprocessing executables for djinn-2009.2.1...
>>> Building djinn-2009.2.1...
>>> [1 of 7] Compiling REPL ( src/REPL.hs, dist/build/djinn/djinn-tmp/REPL.o )
>>> Ambiguous type variable `e' in the constraint:
>>> `Control.Exception.Exception e'
>>> arising from a use of `Control.Exception.catch'
>>> at src/REPL.hs:(18,17)-(33,12)
>>> Probable fix: add a type signature that fixes these type variable(s)
>>> dom at linux-6ofq:~/djinn-2009.2.1> ghc --version
>>> The Glorious Glasgow Haskell Compilation System, version 6.10.1
> Build it against base-3 then it works. This is what cabal-install does.
> $ cabal install djinn
> This applies to a load of packages written before base-4 came out (which
> changed the exceptions api). Many such packages did not list
> build-depends: base <4 in their .cabal files. There is what's basically
> a compatibility hack in cabal-install to make this continue to work for
> old packages.
Thanks. I thought it was probably something like that but I thought I
had better report it.
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