Goal:
    A : Type  f : A → bool
  ============================
   (forallb_InP [] (λ (x : A) (_ : In x []), f x) = forallb f [])


DEBUG:Going to execute:
done
Level 2: evaluation returns
idtac
where
c := forallb_InP l g
of type
constr of type tacvalue

Level 2: evaluation returns
idtac
where
c := forallb_InP l g
of type
constr of type tacvalue