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
------------ Graham Klyne For email: http://www.ninebynine.org/#Contact
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