Hi,
I was trying to install ad (Automatic Differentiation) but got the
following error. I guess the answer is to upgrade my ghc (perhaps
someone could confirm) but I am using the Haskell Platform and would
rather stick with that. I see from http://hackage.haskell.org/platform/
that the next release is due out in May. Will that be early May? in
which case I may well wait a week or will it be late May? in which case
I might bite the bullet and upgrade my ghc.
Thanks, Dominic
Building template-haskell-2.7.0.0...
[1 of 7] Compiling Language.Haskell.TH.Syntax.Internals (
Language/Haskell/TH/Syntax/Internals.hs,
dist/build/Language/Haskell/TH/Syntax/Internals.o )
[2 of 7] Compiling Language.Haskell.TH.Syntax (
Language/Haskell/TH/Syntax.hs, dist/build/Language/Haskell/TH/Syntax.o )
[3 of 7] Compiling Language.Haskell.TH.PprLib (
Language/Haskell/TH/PprLib.hs, dist/build/Language/Haskell/TH/PprLib.o )
Language/Haskell/TH/PprLib.hs:55:10:
Illegal instance declaration for `Show Doc'
(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 `Show Doc'
Updating documentation index /Users/Test/Library/Haskell/doc/index.html
cabal: Error: some packages failed to install:
ad-1.3.0.1 depends on template-haskell-2.7.0.0 which failed to install.
template-haskell-2.7.0.0 failed during the building phase. The exception
was:
ExitFailure 1
The Glorious Glasgow Haskell Compilation System, version 7.0.3
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