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[no subject]

Having a prompt dynamic-variable which the rubout handler looks
at is, of course, a good idea.  I don't see how this has anything to
do with streams except in so far as the rubout handler might be
associated with a particular stream if that was the way it worked.

Since a process can only be inputting from one stream at a time
a dynamically-bound variable is the right thing.  The prompt certainly
should not be an attribute of the stream; it is an attribute of the
particular call to read or readline or readfrob or whatever.