Goal:
  
  A : Type
  B : Type
  P : A → Type
  Q : A → B → Type
  H2 : ∀ (x : A) (y : B), In y [] → P x → Q x y
  Hl : 0 = 0
  ============================
   (let H := CoreTactics.block in let H0 := CoreTactics.block in All2 Q [] [])


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

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

Failed to progress.