Cool. thanks. I was actually wondering why those instances didn't exist as they seemed pretty obvious and I almost made them conditional. I'll modify your patch to be an actual feature check with the HAS_TRAVERSABLE_TUPLE check. On Tue, May 13, 2014 at 11:20 AM, Sergei Trofimovich wrote:

1 patch for repository http://repetae.net/repos/jhc:

Tue May 13 21:19:19 FET 2014 Sergei Trofimovich * src/Support/Inst.hs: don't define instances present in ghc-7.8

[ 85 of 183] Compiling Support.Inst ( src/Support/Inst.hs, src/Support/Inst.o )

src/Support/Inst.hs:7:10: Duplicate instance declarations: instance [overlap ok] Foldable ((,) a) -- Defined at src/Support/Inst.hs:7:10 instance Foldable ((,) a) -- Defined in 'Data.Foldable'

src/Support/Inst.hs:9:10: Duplicate instance declarations: instance [overlap ok] Traversable ((,) a) -- Defined at src/Support/Inst.hs:9:10 instance Traversable ((,) a) -- Defined in 'Data.Traversable'

[src/Support/Inst.hs: don't define instances present in ghc-7.8 Sergei Trofimovich **20140513181919 Ignore-this: 846e90c9a24c9eccc5c7358078529a72

[ 85 of 183] Compiling Support.Inst ( src/Support/Inst.hs, src/Support/Inst.o )

src/Support/Inst.hs:7:10: Duplicate instance declarations: instance [overlap ok] Foldable ((,) a) -- Defined at src/Support/Inst.hs:7:10 instance Foldable ((,) a) -- Defined in 'Data.Foldable'

src/Support/Inst.hs:9:10: Duplicate instance declarations: instance [overlap ok] Traversable ((,) a) -- Defined at src/Support/Inst.hs:9:10 instance Traversable ((,) a) -- Defined in 'Data.Traversable' ] hunk ./src/Support/Inst.hs 1 +{-# LANGUAGE CPP #-} module Support.Inst where

import Control.Applicative hunk ./src/Support/Inst.hs 8 import Data.Foldable import Data.Traversable

+#if __GLASGOW_HASKELL__ < 708 instance Foldable ((,) a) where foldMap = foldMapDefault instance Traversable ((,) a) where hunk ./src/Support/Inst.hs 13 traverse f (x,y) = (,) x <$> f y +#endif

instance Functor ((,,) a b) where fmap = fmapDefault

-- John Meacham - http://notanumber.net/