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bindings of ECHOFILES in LISP

Neither the break loop nor the interrupt handler rebinds ECHOFILES
to anything.  Apparently the probelm, for you, is that the system-
supplied ttyscanner is rebinding echofiles to nil (which is a good
idea), and when you interrupt out of the scanner, you find yourself
in a state where echofiles is ().  This doesn't happen, for example
if you interrupt out of some random computation.  You can supply your
own scanner, perhaps modeled after the system-supplied one, by