1:      1  1 CALL pred all_solutions.main/2-0 (det) all_solutions.m:20
mdb> echo on
Command echo enabled.
mdb> context none
Contexts will not be printed.
mdb> register --quiet
mdb> break hello
 0: + stop  interface pred all_solutions.hello/1-0 (multi)
mdb> continue
      16:     10  5 CALL pred all_solutions.hello/1-0 (multi)
mdb> stack
   0       pred all_solutions.hello/1-0 (multi)
   1       pred solutions.builtin_aggregate/4-0 (cc_multi)
   2       pred solutions.builtin_solutions/2-0 (cc_multi)
   3       pred solutions.solutions/2-0 (det)
   4       pred all_solutions.main/2-0 (det)
mdb> retry 1
       4:      4  4 CALL pred solutions.builtin_aggregate/4-0 (cc_multi)
mdb> retry 2
       2:      2  2 CALL pred solutions.solutions/2-0 (det)
mdb> retry 3
not that many ancestors
mdb> continue -n -S
Hello again, world
Hello, world