Re: Prelude not in haskell98?

Iavor Diatchki wrote:

Hi, Just curious, what external modules does the Prelude depend on? The only unusual feature that I can think of in the GHC Prelude is the fact that the partial functions throw exceptions, and so perhaps the Prelude implementation uses some extra modules for that?

I'm not really sure what you mean by "external modules". In GHC the Prelude is comprised almost entirely of re-exports from other modules. You can follow the source code links from the Haddock docs to take a look: http://www.haskell.org/ghc/docs/latest/html/libraries/base/Prelude.html One big dependency is that the Prelude exports some I/O functionality, so it pulls in the entire I/O library. Cheers, Simon

-Iavor

On 6/6/07, Simon Marlow wrote:

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Stefan O'Rear wrote:

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Right, the problem is that if Prelude was in haskell98 then it wouldn't be possible to have a program that /didn't/ depend on haskell98 (short of -fno-implicit-prelude extensions, or having a Prelude in both (which would mean you couldn't depend on both base and haskell98)). There's also a pragmatic reason. Currently it is impossible to have a cycle of module imports cross package boundaries; so if the Prelude was in haskell98, then (since the Prelude depends on non-haskell98 base modules for its implementation) *Nothing* in base could use the

Isaac Dupree wrote: prelude.

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(Assuming haskell98 depends on base currently) It seems we would want haskell98 to re-export base's Prelude. It's just that that's not implemented in released-ghc package management code.

Yes, packages that re-export modules would be a useful feature. Then we could have a version of the base package that only exported the compiler-independent modules, for example.

Cheers, Simon _______________________________________________ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users