Goal:
  
  A : Type
  P : list A → list A → A → A → Type
  Γ : list A
  H : All2_fold P Γ Γ
  ============================
   (let H := CoreTactics.block in
    let H0 := CoreTactics.block in
    All_fold (λ (Γ : list A) (d : A), P Γ Γ d d) Γ)


DEBUG:Going to execute:
DepElim.generalize_by_eqs_vars H
Level 0: Backtrace:

Failed to progress.
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Failed to progress.
Level 0: Backtrace:

Failed to progress.
Level 0: Backtrace:

Failed to progress.
Level 0: Backtrace:

Failed to progress.