[m-rev.] for review: add predicate versions of int.fold_up/down

[Ralph Becket]

Julien Fischer, Friday, 26 March 2004:
> 
> Estimated hours taken: 1
> Branches: main
> 
> Add predicate versions of int.fold_up and int.fold_down.
> 
> XXX We should probably consider swapping the order of
> the arguments in the function versions so they correspond
> to the predicate versions more closely.

Ah, sorry about that.  The Mercury standard library argument order (with
the range coming before the initial accumulator) for folds is (a) less
useful for higher order programming and (b) different to what you'll
find in Haskell libraries etc.  I slipped up when adding fold_up/down -
now is probably the right time to change that if you want.

-- Ralph
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