E1:     C1 CALL pred track_through_catch.main/2-0 (cc_multi) track_through_catch.m:18
mdb> mdb> echo on
Command echo enabled.
mdb> untrust 0
mdb> table_io start
I/O tabling started.
mdb> break try
Ambiguous procedure specification. The matches are:
0: pred exception.try/2-0 (cc_multi)
1: pred exception.try/2-1 (cc_multi)
2: pred exception.try/2-2 (cc_multi)
3: pred exception.try/2-3 (cc_multi)

Which do you want to put a breakpoint on (0-3 or *)? *
 0: + stop  interface pred exception.try/2-0 (cc_multi)
 1: + stop  interface pred exception.try/2-1 (cc_multi)
 2: + stop  interface pred exception.try/2-2 (cc_multi)
 3: + stop  interface pred exception.try/2-3 (cc_multi)
mdb> c
      E2:     C2 CALL pred exception.try/2-0 (cc_multi) exception.m:NNNN (track_through_catch.m:20)
mdb> f
      E3:     C2 EXIT pred exception.try/2-0 (cc_multi) exception.m:NNNN (track_through_catch.m:20)
mdb> dd
try(q(2), succeeded(2))
Valid? b 2
browser> cd 1
browser> track
succeeded(2)
p(2)
Valid? info
Context of current question : track_through_catch.m:25 (track_through_catch.m:19)
Search mode                 : top down                                           
The current question was chosen because the marked subterm was bound by
the unification inside the predicate track_through_catch.p/1
(track_through_catch.m:25). The path to the subterm in the atom is 1.
dd> quit
Diagnosis aborted.
      E3:     C2 EXIT pred exception.try/2-0 (cc_multi) exception.m:NNNN (track_through_catch.m:20)
mdb> quit -y