Why is partition no good list producer?

[Johannes Waldmann]

Jan Scheffczyk wrote:

> I'm about to optimize a fairly large Haskell program, which uses 
> partition quite often (and a fold immediately afterwards).
> The GHC User guide section about RULE pragmas says that filter is a 
> good producer, whereas partition is not mentioned (therefore, I 
> assume it is not).

what you observe is possibly related to this:

http://www.mail-archive.com/haskell@haskell.org/msg07508.html
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