Goal:
    A : Type  RA : ReflectEq A  x : list A  y : list A
  ============================
   (reflectProp (x = y) (eqb_list eqb x y))


DEBUG:Going to execute:
fun H =>
             let ph := fresh "X" in
             let ph' := fresh "X" in
             destruct H as [H ph ph']