Goal:
  
  A : Type
  P : list A → A → Type
  b0 : All_fold P []
  d : A
  Γ : list A
  b : All_fold P Γ
  p : P Γ d
  ============================
   ({| pr1 := []; pr2 := b0 |} =
    {| pr1 := d :: Γ; pr2 := All_fold_cons P b p |}
    → let H := CoreTactics.block in
      NoConfusionHom_All_fold A P [] (All_fold_nil P) b0
      → let H0 := CoreTactics.block in All_fold_nil P = b0)


DEBUG:Going to execute:
DepElim.simplify_one_dep_elim
Level 4: Backtrace:

Tactic failure (level 1).
Level 3: Backtrace:

Tactic failure.
Level 2: Backtrace:

Tactic failure.