Goal:
  
  f : EdgeSet.elt -> EdgeSet.elt
  es : EdgeSet.t
  e : EdgeSet.elt
  __view_subject_1_ : In e (EdgeSet.elements es)
  ============================
   (In (f e) (map f (EdgeSetProp.to_list es)))


DEBUG:Going to execute:
<coq-core.plugins.ssreflect::ssrapply@0> $1