Label macro expansion bug In HList.

aditya siram

9 Nov 2011 9 Nov '11

12:13 a.m.

Hi all, I am exploring OOHaskell and ran into some compilation issues with some of the samples. I hope this is the right place to report it. For example "OCamlTutorial.hs" generates the following error: ../samples/OCamlTutorial.hs:98:3: Multiple declarations of `foo' Declared at: ../samples/OCamlTutorial.hs:54:1 ../samples/OCamlTutorial.hs:98:3 Failed, modules loaded: OOHaskell, Dynamic, Print, DeepNarrow, Nominal, New. This is happening because the "label" macro on line 98: $(label "varX") doesn't expand correctly and clashes with the "foo" function on line 54: foo f = f # field1 The "label" function is found in the Data.HList.MakeLabels module and should work this way according to the docs:

...

runQ (label "test") >>= putStrLn . pprint data Test deriving (Data.Typeable.Internal.Typeable) test = Data.HList.FakePrelude.proxy :: Data.HList.FakePrelude.Proxy Test

But I get: data Foo_0 deriving (Data.Typeable.Internal.Typeable) foo_1 = Data.HList.FakePrelude.proxy :: Data.HList.FakePrelude.Proxy Foo_0 This still doesn't cleanly explain why "OCamlTutorial.hs" is failing since it seems to be generating unique datatypes and functions by suffixing them with a number, but it seems to point to the problem. I'm hoping someone who knows HList better might understand it better. Thanks, -deech

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oleg＠okmij.org

9 Nov 9 Nov

10:16 a.m.

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).

aditya siram

12 Nov 12 Nov

3:20 a.m.

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, 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).

aditya siram

3:33 a.m.

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 ../samples/OCamlTutorial.hs:97:3: Multiple declarations of `foo' Declared at: ../samples/OCamlTutorial.hs:53:1 ../samples/OCamlTutorial.hs:97:3 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 GHCI. -deech On Fri, Nov 11, 2011 at 1:20 PM, aditya siram 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, 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).

aditya siram

4:03 a.m.

I have verified that the issue with the "makeLabels" function goes away if I install 7.0.4. I got an extremely large error (~ 5000 lines) when loading "OCamlTutorial.hs". When I've parsed through it, I'll post back. Sorry for the confusion. -deech On Fri, Nov 11, 2011 at 1:33 PM, aditya siram wrote:

...

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 ../samples/OCamlTutorial.hs:97:3: Multiple declarations of `foo' Declared at: ../samples/OCamlTutorial.hs:53:1 ../samples/OCamlTutorial.hs:97:3

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 GHCI.

-deech

On Fri, Nov 11, 2011 at 1:20 PM, aditya siram 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, 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).

oleg＠okmij.org

12:25 p.m.

...

I have verified that the issue with the "makeLabels" function goes away if I install 7.0.4.

I'm glad to hear that. GHC 7.0.4 has updated Template Haskell in backward-incopatible ways.

...

I got an extremely large error (~ 5000 lines) when loading "OCamlTutorial.hs".

Quite likely the reason was the Data.HList.TypeEqO import that you have commented out. Data.HList.TypeEqO is really needed. I have pushed the changed HList.cabal. (I must admit I use HList without cabal-installing it: I simply arrange OOHaskell and HList as sibling subdirectories. See OOHaskell/samples/Makefile).

aditya siram

1:06 p.m.

Thanks for updating the Cabal file. The reason I commented out the Data.HList.TypeEqO was because I couldn't find it. I grepped the HList source tree for it and I found references to it only in the following places: ./Data/HList/RecordD.hs:import Data.HList.TypeEqO ./examples/TIPTransform.hs:import Data.HList.TypeEqO ./examples/MainGhcGeneric1.hs: module Data.HList.TypeEqO, ./examples/MainGhcGeneric1.hs:import Data.HList.TypeEqO ./examples/MainPatternMatch.hs:import Data.HList.TypeEqO ./examples/TIPTransformM.hs:import Data.HList.TypeEqO ./HList.cabal: Data.HList.HListPrelude, Data.HList.TypeEqO, I couldn't find it on Hoogle or Hayoo either. Am I missing something? -deech On Fri, Nov 11, 2011 at 10:25 PM, wrote:

...

...
I have verified that the issue with the "makeLabels" function goes away if I install 7.0.4.

I'm glad to hear that. GHC 7.0.4 has updated Template Haskell in backward-incopatible ways.

...
I got an extremely large error (~ 5000 lines) when loading "OCamlTutorial.hs".

Quite likely the reason was the Data.HList.TypeEqO import that you have commented out. Data.HList.TypeEqO is really needed. I have pushed the changed HList.cabal. (I must admit I use HList without cabal-installing it: I simply arrange OOHaskell and HList as sibling subdirectories. See OOHaskell/samples/Makefile).

oleg＠okmij.org

1:14 p.m.

...

The reason I commented out the Data.HList.TypeEqO was because I couldn't find it.

My apologies! It turns out I have forgotten to 'darcs add' it. It is committed now: http://code.haskell.org/HList/Data/HList/TypeEqO.hs

aditya siram

1:22 p.m.

Awesome! The samples now work. Thanks so much for your help. -deech On Fri, Nov 11, 2011 at 11:14 PM, wrote:

...

...
The reason I commented out the Data.HList.TypeEqO was because I couldn't find it.

My apologies! It turns out I have forgotten to 'darcs add' it. It is committed now: http://code.haskell.org/HList/Data/HList/TypeEqO.hs

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aditya siram
oleg＠okmij.org

Label macro expansion bug In HList.

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