Goal:
  
  f : Edge.t -> Edge.t
  es : EdgeSet.t
  e : EdgeSet.elt
  x : Edge.t
  __view_subject_1_ : EdgeSet.In x es
  ============================
   (f x = f x /\ EdgeSet.In x es)


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