Goal:
  
  B : Type
  C : Type
  A : B → Type
  D : C → Type
  l : list B
  l' : list C
  a : All A l
  all : All2 (λ (_ : B) (y : C), D y) l l'
  ============================
   (∀ (x : B) (y : C), (λ (_ : B) (y0 : C), D y0) x y → D y)


DEBUG:Going to execute:
<coq-core.plugins.ltac::auto@0> $1 $2 $3
Level 1: Backtrace:

No applicable tactic.
Level 0: Backtrace:

No applicable tactic.