[jhc] containers package

[Henning Thielemann]

On Mon, 16 Nov 2009, Chris Eidhof wrote:

> It seems like JHC won't compile the darcs version of the containers library. 
> After removing some pragmas, it failed to compile Data.Sequence at some quite 
> normal-looking datatype. It fails with a parse error, I'm not sure why, but 
> I'll investigate it later.

I also noticed this yesterday. It is data PQueue, actually rather common.