Goal:
    A : Type
  ============================
   (Reflexive option_extends)


DEBUG:Going to execute:
intros []

Goals:
    A : Type  a : A
  ============================
   (option_extends (Some a) (Some a))

    A : Type
  ============================
   (option_extends None None)


DEBUG:Going to execute:
constructor

Goals:
    A : Type  a : A
  ============================
   (option_extends (Some a) (Some a))

    A : Type
  ============================
   (option_extends None None)


DEBUG:Going to execute:
<coq-core.plugins.ltac::constructor@0>