Goal:
    A : Type  Aeq : ReflectEq A  x : A  y : A  H : reflectProp (x = y) false
  ============================
   (~ option_extends (Some x) (Some y))


DEBUG:Going to execute:
inversion 1
Level 0: Backtrace:

The type has no constructors.
Level 0: Backtrace:

The type has no constructors.