Goal:
    x : V.t  n : Z  y : V.t  H0 : V.lt x x
  ============================
   False


DEBUG:Going to execute:
PTRDEBUGTACLtac.assumption
Level 3: evaluation returns
<coq-core.plugins.tauto::is_empty@0>
where
tauto_flags := 
of type
tauto_flags
X1 := V.lt x x
of type
constr of type tacvalue

Level 3: Backtrace:

Tactic failure.
Level 3: Backtrace:

Tactic failure.
Level 2: Backtrace:

Tactic failure.
Level 2: Backtrace:

Tactic failure.