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[no subject]

Well, you are right about ERR using ERUNDO also, but there is this
weird behaviour that I hadn't noticed before:
  If (ERR NIL)  breaks up an errset, then the ERRSET handler is not
  called at all, whereas if (ERR <non-NIL frob>) breaks up the
  ERRSET, then the handler is called.
So I will take the cheap and dirty solution - cause the COMPLR to output
the extra instruction "(MOVEI 1 'T)", but I'm still not sure that we
have the semantics of all this worked out yet.