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Since the primary function of pretty-print is to format code, shouldn't
it be defined in terms of write rather than display? For consistency
with ~& it may actually make sense to define the minimal pretty-print to
be something like
(define (pretty-print obj port)
(newline port)
(write obj port)
(newline port))
Should ~C display the character, write the character, or display the
name of the character as in CL? ~A is for display and ~S for write, so
I would suggest the latter (currently it's the equivalent of ~A).
--
Alex