Goal:
    s : t  s' : t  e : false = false  H : lt s' s  H0 : s = s'
  ============================
   False


DEBUG:Going to execute:
solve
[ do
![ solve
 [ trivial | apply : Logic.eq_sym ; trivial ]
 | discriminate
 | contradiction
 | Ltac.split ]
| case not_locked_false_eq_true; Ltac.assumption
| match goal with
  | H:~ _ |- _ => solve [ case H; trivial ]
  end ]