[Haskell] Ref class?

[haskell at list.mightyreason.com]

Try http://haskell.org/haskellwiki/Library/ArrayRef#Monad-independent_references

Conal Elliott wrote:
> does anyone know where there's a class that abstracts over IORefs? it
> includes newRef, readRef, and writeRef.  i've seen it but can't remember
> where.  - conal
> 
> 
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