1:      1  1 CALL pred small.main/2-0 (det) small.m:13
mdb> echo on
Command echo enabled.
mdb> register --quiet
mdb> break p
 0: + stop  interface pred small.p/1-0 (det)
mdb> continue
       2:      2  2 CALL pred small.p/1-0 (det) small.m:20 (small.m:14)
mdb> finish
       3:      2  2 EXIT pred small.p/1-0 (det) small.m:20 (small.m:14)
mdb> dd -d 3 -n 7
p(42)
Valid? no
Found incorrect contour:
p(42)
Is this a bug? yes
       3:      2  2 EXIT pred small.p/1-0 (det) small.m:20 (small.m:14)
mdb> continue
42