Goal:
    A : Type  HA : ReflectEq A  a : A
  ============================
   (None <> Some a)


DEBUG:Going to execute:
Ltac.symmetry; trivial
Level 1: Backtrace:

 The relation (fun x y : option A => x <> y) is not a declared reflexive relation. Maybe you need to require the Coq.Classes.RelationClasses library
Level 0: Backtrace:

 The relation (fun x y : option A => x <> y) is not a declared reflexive relation. Maybe you need to require the Coq.Classes.RelationClasses library