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Computed goto's

Thinking about it there are times when one would like to do a computed goto.
I notice that (go tag) in tagbody is explicitly not calculated.  For 
maximum effect the computation should result directly in a dispatched
goto.  One can get the effect of this by using lambda's in an array and
doing an array lookup but this is somewhat more expensive (?).

Any suggestions about this?  

Doug (doug@enx.prime.com)