Safe Guile?

[thi <ttn at mingle dot glug dot org>]

knotwell writes:

 > I think you could use the undefine macro to accomplish what you need.
 > Perhaps others on the list could say whether it's a good idea or
 > not. . .

please see

  http://sourceware.cygnus.com/ml/guile/1998-09/msg00179.html

where marius vollmer disabuses me of an improper implementation and
tells of the preferred way to get a safe environment.

cheers,
thi