producing and consuming lists

[Hal Daume III]

Jorge,

> But like I just showed, sometimes paring them may not be a natural approach 
> though...

Yeah, I understand what you mean.  In the examples you give, you could
always try to make the appended stuff (the zs, etc) the same length by
appending Nothings, but probalby not a general solution.

I wonder if, given you original function which returns ([Int],[Int]), you
couldn't do something really ugly like using unsafeInterleaveIO on writing
the first list, and then write the second list "by hand".

Just a thought.

 - Hal