*trace-indent-width*
is the extra amount by which the traced output for function calls is indented upon entering a deeper level of nesting (i.e. a traced call from a function that is itself traced). If it is 0 then no indentation occurs.
USER 7 > (setq *trace-indent-width* 4
*max-trace-indent* 50)
50
USER 8 > (defun quad (a b c) (- (* b b) (* 4 a c)))
QUAD
USER 9 > (trace quad *)
*
USER 10 > (quad 4 3 14)
0 QUAD > (4 3 14)
1 * > (3 3)
1 * < (9)
1 * > (4 4 14)
1 * < (224)
0 QUAD < (-215)
-215