Goal:
  
  A : Type
  P : A → Prop
  x : A
  l : list A
  H : P x
  H0 : Forall P l
  IHForall : ∀ n : nat, Forall P (firstn n l)
  ============================
   (Forall P [])


DEBUG:Going to execute:
<coq-core.plugins.ltac::constructor@0>

Goals:

DEBUG:Going to execute:
auto

Goals:

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