Goal:
  
  A : Type
  B : Type
  C : Type
  R : A → B → C → Type
  x : A
  y : B
  z : C
  l : list A
  l' : list B
  l'' : list C
  r : R x y z
  a : All3 R l l' l''
  r0 : R x y z
  b : All3 R l l' l''
  ============================
   (NoConfusionHom_All3 A B C R (x :: l) (y :: l') 
      (z :: l'') (All3_cons r a) (All3_cons r0 b)
    → let H := CoreTactics.block in All3_cons r a = All3_cons r0 b)


DEBUG:Going to execute:
match goal with
           | |- let _ := CoreTactics.block in _ => intros _
           | |- _ => try (intro; CoreTactics.intros_until_block)
           end