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I was in the process of implementing TAGBODY in terms of LABELS (each
piece of straightline code turns into a function, and GO turns into
function calls), but upon perusing CLtl more closely, I found that
the GO is apparently supposed to undo catchers, which wouldn't happen
if it becomes a function call...  Is this analysis correct?  If so,
then perhaps the standard deserves something a little stronger than
the phrase "can break up catchers if necessary to get to the target"
(middle of p. 131), which leaves me wondering what else GOs are supposed
to do to get to those elusive targets...