[Haskell-cafe] Weird error during derive-18.104.22.168 build
byorgey at seas.upenn.edu
Mon Dec 13 12:03:06 CET 2010
On Mon, Dec 13, 2010 at 12:07:25AM +0200, Alex wrote:
> Hi all.
> I am trying to install the "yi" editor using cabal-install, which in turns
> installs the package 'derive-22.214.171.124'. I get the following error during
> derive's compilation:
> [53 of 58] Compiling Data.Derive.Internal.Traversal (
> dist/build/Data/Derive/Internal/Traversal.o )
> Illegal instance declaration for `Applicative (Writer w)'
> (All instance types must be of the form (T t1 ... tn)
> where T is not a synonym.
> Use -XTypeSynonymInstances if you want to disable this.)
> In the instance declaration for `Applicative (Writer w)'
> cabal: Error: some packages failed to install:
> derive-126.96.36.199 failed during the building phase. The exception was:
> ExitFailure 1
The problem appears to be that derive-188.8.131.52 does not work with
mtl-2. The newest version of derive does, but yi specifies a
dependency on derive-2.3.*. One thing worth trying is to
cabal fetch yi
and change the
build-depends: derive >=2.3 && <2.4
build-depends: derive >=2.3 && <2.5
Then run 'cabal install' to build yi from the local directory.
If it works, you should inform the yi maintaner.
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