exporting functions which raise exceptions

[Alastair Reid]

>> I'm not sure I see the difficulty - but I'll go ahead and make up
>> my own solution (which will probably be much like what GreenCard
>> does...)

> What does GreenCard do?

It does its best to return to the read eval print loop.

If that fails (hmmm, not sure I understand what would cause that
failure), it calls exit.  A bit more error reporting seems to be
called for here...

-- 
Alastair Reid        reid at cs.utah.edu        http://www.cs.utah.edu/~reid/