jsnow:
> This seems like it ought to be pretty innocuous, unless the whole list
> is getting evaluated each time I cons a new entry, or if readTVar or
> writeTVar are much more expensive than they appear.
>
For general details on the complexity of IORef, MVar or TVar structures,
see
Comparing the performance of concurrent linked-list implementations
in Haskell (Martin Sulzmann, Edmund S. L. Lam, Simon Marlow)
Submitted to DAMP'09, October 2008
http://www.haskell.org/~simonmar/papers/concurrent-data.pdf
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