On Sun, Oct 2, 2011 at 8:31 PM, Brandon Moore
template-haskell-2.6.0.0 has inaccurate dependencies thatlead cabal-install to attempt to install it on 6.12.3
The .cabal specifies
build-depends: base >= 4.2 && < 5,
but assumes TypeSynonymInstances in PprLib.hs
(only true by default after Haskell2010 became default in ghc-7.0.1),
instance Show Doc
and PPr.lhs
import GHC.Show( showMultiLineString ) (added in commit e8d11b1, labeled 4.3.0.0)
It seems the dependency should be at least base >= 4.3, and either the LANGUAGE pragma or cabal file updated.
If the package isn't meant to be upgraded, should it be on hackage at all?
Using an install of the template-haskell library other than the one GHC was built against will make GHC unhappy - the operations in the library won't type-check against the built-in GHC magic.
Brandon
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