Really bad code for single method dictionaries?

[Don Stewart]

I don't think this is still  the case. 

Roman, do you remember?

- Don

jason.dusek:
>   I was reading the stream fusion code today and came across a comment stating
>   that single element dictionaries interacted poorly with GHC's optimizer:
> 
>     class Unlifted a where
> 
>       [...]
>       expose [...]
> 
>       -- | This makes GHC's optimiser happier; it sometimes produces really bad
>       -- code for single-method dictionaries
>       --
>       unlifted_dummy [...]
> 
>   A cursory search on GHC's Trac shows no corresponding bug; is this no longer
>   a problem? A small problem? I would like to know more about it.
> 
> --
> Jason Dusek
> 
> 
> 
>  |...stream fusion code...|
>   http://www.cse.unsw.edu.au/~dons/code/streams/list/Data/Stream.hs
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