Goal:
  
  A : Type
  B : Type
  R : A → B → Type
  P : list A → list B → Type
  X : P [] []
  X0 : ∀ (x : A) (y : B) (l : list A) (l' : list B),
         R x y → All2 R l l' → P l l' → P (l ++ [x]) (l' ++ [y])
  l0 : list B
  ============================
   (P [] [])


DEBUG:Going to execute:
<coq-core.plugins.ltac::eauto@0> $1 $2 $3
Level 1: evaluation returns
inversion_clear H
where
H := a
of type
constr of type tacvalue