Haskell 2010 libraries

Ian Lynagh igloo at earth.li
Sat May 1 15:17:41 EDT 2010

On Sat, May 01, 2010 at 08:05:58PM +0100, Simon Marlow wrote:
> On 01/05/10 17:16, Ian Lynagh wrote:
>>> So it seems this is closer to option (2) in my message, because
>>> portablebase and haskell2010 overlap, and are therefore mutually
>>> exclusive, whereas in (4) haskell2010 and base2010 are non-overlapping -
>>> that's the crucial difference.
>> If they are non-overlapping, how would a new Data.List function be
>> added? Or an existing Data.List function be altered?
> In this scenario there would be base as it is now, and base2010 (or  
> whatever you want to call it) that is base minus the modules in  
> haskell2010.  So you can add things to base:Data.List, but  
> haskell2010:Data.List must export exactly the API as specified in the  
> report.

So someone using haskell2010+base2010 wouldn't be able to use this new

>>> I described this as a non-option because I thought trying to use the
>>> packages together might be a common problem that leads to obscure error
>>> messages about ambiguous modules, but perhaps it's not that bad, or at
>>> least not worse than the other solutions.
>> Direct imports of base* and haskell* could be (dis)allowed by the
>> implementation depending on whether it is in "Haskell 2010 mode" or not.
> Not sure what you mean here - modules are imported, not packages.  Type  
> error!

Heh, true. I meant that e.g.
    ghc --language haskell2010 -package base ...
would give an error.


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