Goal:
  
  A : Type
  B : Type
  R : A → B → Type
  R' : ∀ (a : A) (b : B), R a b → Type
  ============================
   (let H := CoreTactics.block in
    let H0 := CoreTactics.block in
    noConfusionHom_All2_dep_obligation_2 A B R R' [] [] All2_nil All2_dep_nil
      All2_dep_nil
      (noConfusionHom_All2_dep_obligation_1 A B R R' [] [] All2_nil
         All2_dep_nil All2_dep_nil I) = I)


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

No matching clauses for match.