Goal:
    n : t
  ============================
   (n + Some 0 = n)


DEBUG:Going to execute:
destruct n

Goals:
    z : Z
  ============================
   (Some z + Some 0 = Some z)

  
  ============================
   (None + Some 0 = None)


DEBUG:Going to execute:
try reflexivity
DEBUG LTAC Evaluated term: n