looking for data structure advice

[Graham Klyne]

At 14:17 12/12/03 -0500, Derek Elkins wrote:
>This will also provide a migration path if you want a more featureful
>monad.  (or_maybe is mplus, fail or mzero can be used for Nothing when
>you explicitly want to fail).

Is this or_maybe (and friends) actually defined in any of the standard 
libraries?  (Google found only one hit, in an old IRC log.)

#g


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Graham Klyne
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