Goal:
    G : t  s0 : VSet.t  x : V.t
  ============================
   (0 = 0)


DEBUG:Going to execute:
constructor 1
Level 3: evaluation returns
<coq-core.plugins.tauto::is_unit_or_eq@0>
where
tauto_flags := 
of type
tauto_flags
X1 := 0 = 0
of type
constr of type tacvalue