[Haskell-cafe] Label macro expansion bug In HList.

aditya siram aditya.siram at gmail.com
Fri Nov 11 20:33:07 CET 2011

I also have the same issue with OOHaskell after pulling from
http://code.haskell.org/OOHaskell. After loading GHCI I did:
> :l ../samples/OCamlTutorial.hs
    Multiple declarations of `foo'
    Declared at: ../samples/OCamlTutorial.hs:53:1
Failed, modules loaded: OOHaskell, Dynamic, Print, DeepNarrow, Nominal, New.

Also in the beginning I was unable to load lib/OOHaskell.hs into GHCI
because it tried to import a module that was no-longer exported by HList
"Data.HList.TypeEq0". When I commented out that line, it loaded fine into


On Fri, Nov 11, 2011 at 1:20 PM, aditya siram <aditya.siram at gmail.com>wrote:

> I just pulled the latest version of HList :
> > darcs clone http://code.haskell.org/HList
> I compiled it with GHC 7.2.1 and I am still running into the same issue
> the "makeLabels" function:
> > runQ (makeLabels ["test1","test2"]) >>= putStrLn . pprint
> data Foo_0 deriving (Data.Typeable.Internal.Typeable)
> foo_1 = Data.HList.FakePrelude.proxy :: Data.HList.FakePrelude.Proxy Foo_0
> data Foo_2 deriving (Data.Typeable.Internal.Typeable)
> foo_3 = Data.HList.FakePrelude.proxy :: Data.HList.FakePrelude.Proxy Foo_2
> Also the cabal file that is currently at the tip of the repository
> includes some of the files that have been moved into the "obsolete"
> directory. I have attached an updated HList.cabal file that seems to work
> on my machine.
> Thanks!
> -deech
> On Tue, Nov 8, 2011 at 8:16 PM, <oleg at okmij.org> wrote:
>> I believe this is the case of OOHaskell gotten a bit out of sync with
>> HList and GHC. Please use the latest code bases
>>        http://code.haskell.org/HList
>>        http://code.haskell.org/OOHaskell
>> OCamlTutorial and all other OOHaskell code should work (with GHC
>> 7.0.4).
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