Goal:
  
  A : Type
  B : Type
  P : B → A → A → Type
  i : list B
  tl : list A
  tl' : list A
  ============================
   (OnOne2All P i tl tl' → #|[]| = 0 → OnOne2All P ([] ++ i) tl tl')


DEBUG:Going to execute:
<coq-core.plugins.ltac::trivial@0> $1 $2

Goals:

DEBUG:Going to execute:
hnf

Goals:

DEBUG:Going to execute:
intros

Goals:

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