Goal:
  
  G : t
  HI : invariants
  A : Prop
  B : Prop
  n : ~ B
  H0 : A
  H1 : A -> B
  H2 : B -> A
  ============================
   False


DEBUG:Going to execute:
red in id
Level 2: evaluation returns
<coq-core.plugins.tauto::is_conj@0>
where
tauto_flags := 
of type
tauto_flags
X1 := B -> A
of type
constr of type tacvalue

Level 2: Backtrace:

Tactic failure.
Level 2: Backtrace:

Tactic failure.
Level 1: Backtrace:

Tactic failure.
Level 1: Backtrace:

Tactic failure.
Level 1: Backtrace:

Tactic failure.
Level 1: Backtrace:

Tactic failure.