[Haskell-cafe] deepseq- missing Data.Map instance

Daniel Fischer daniel.is.fischer at googlemail.com
Tue Nov 15 23:50:43 CET 2011

On Tuesday 15 November 2011, 23:26:04, Henry Laxen wrote:
>  So I
> guess my question is:  Is there a reason that the map instance was
> removed from deepseq-,


> and can we please put it back in?


The NFData instance has been moved to the containers package, where it can 
be more efficiently done. The change is already in the latest released 
deepseq version, but will only be in the containers version to be released 
with ghc-7.4.

For your unfortunate combination, consider reverting to a prior deepseq 
version, or manually provide the instance where needed (I recommend the 

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