Goal:
  
  A : Type
  n : nat
  IHn : ∀ l : list A, #|l| ≤ n → skipn n l = []
  h : #|[]| ≤ S n
  ============================
   (skipn (S n) [] = [])


DEBUG:Going to execute:
fun => <coq-core.plugins.ltac::reflexivity@0>