Proposal: Remove Data.HashTable from base

Simon Marlow marlowsd at
Fri Jun 15 16:35:01 CEST 2012

On 14/06/2012 22:04, Ian Lynagh wrote:

> Historically, Data.HashTable has been in base because Data.Typeable used
> it, but that is no longer the case.
> I propose that we:
> * Mark it as deprecated in the base that comes with GHC 7.6.
> * Remove it from the base that comes with GHC 7.8.
> Rationale:
> * Historically there have been performance problems with it, and we have
>    been recommending people not to use it. I'm not sure if that's still
>    the case or not.
> * If it is still useful then it would fit better in the containers
>    package. However, as there is no reason that it needs to be tied to
>    the GHC release schedule etc, it would be even better to put it in
>    another package.
> In GHC, deSugar/Coverage.lhs does use the module, but only for
> hashString. We could put this elsewhere in base, but I think it would be
> better just to copy the definition into the GHC source.
> Suggested discussion deadline: Fri 29 June 2012.


I'm sure the implementations from the hashtables package are much better 


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