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[no subject]

I hate to say this (since it suggests doing something the hard way), but
if MM List Callers is going to know about tracing, then we are getting
into a little bit of the danger of Interlisp, where every advanced
feature knows about every other such feature.  I think maybe we need a
general "advise" "protocol" by which any facility (the built-in Trace,
people's own Trace, metering) can attach stuff to a function definition,
using a standard protocol so that MM List Callers and suchlike can
ignore all advising and get at the real function in a standard way.
(Somebody stomp on me if things already work this way.)  I do think letting
people add their own advising is important.