Goal:
    x : V.t  y : V.t  p : VSet.t  a : V.t
  ============================
   ((x = a \/ y = a \/ VSet.In a p -> y = a \/ x = a \/ VSet.In a p) /\
    (y = a \/ x = a \/ VSet.In a p -> x = a \/ y = a \/ VSet.In a p))


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

Goals:
    x : V.t  y : V.t  p : VSet.t  a : V.t
  ============================
   (x = a \/ y = a \/ VSet.In a p -> y = a \/ x = a \/ VSet.In a p)

    x : V.t  y : V.t  p : VSet.t  a : V.t
  ============================
   (y = a \/ x = a \/ VSet.In a p -> x = a \/ y = a \/ VSet.In a p)


DEBUG:Going to execute:
<Coq.Init.Tauto.not_dep_intros>

Goals:
    x : V.t  y : V.t  p : VSet.t  a : V.t
  ============================
   (x = a \/ y = a \/ VSet.In a p -> y = a \/ x = a \/ VSet.In a p)

    x : V.t  y : V.t  p : VSet.t  a : V.t
  ============================
   (y = a \/ x = a \/ VSet.In a p -> x = a \/ y = a \/ VSet.In a p)


DEBUG:Going to execute:
repeat
            match goal with
            | |- ?X1 -> ?X2 => intro
            | |- ~ _ => unfold not at 1; intro
            end