Goal:
    x : V.t  n : Z  y : V.t  H : V.eq x x /\ n = n /\ V.lt y y
  ============================
   False


DEBUG:Going to execute:
elim id
Level 2: evaluation returns
<coq-core.plugins.tauto::is_conj@0>
where
tauto_flags := 
of type
tauto_flags
X1 := V.eq x x /\ n = n /\ V.lt y y
of type
constr of type tacvalue