Alan Manuel Gloria scripsit:

> We could also use one of the later techniques I eventually settled on:
> have readers return a one-item list to mean "got a datum, here it is!"
> or an empty list to mean "didn't get a datum".  It complicates all
> actions, admittedly - now you have to unwrap the return value - but
> avoids special marker cons cells.

Alternatively (and most Schemely / Common Lisply in my view):  If you
have a value, return it; if you don't have a value, return zero values.

John Cowan                         
        "You need a change: try Canada"  "You need a change: try China"
                --fortune cookies opened by a couple that I know

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