Goal:
    x : t  y : t  Heq_anonymous : true = eqb x y
  ============================
   (x = y)


DEBUG:Going to execute:
match H with
           | H' => fail 2
           | _ => unify X Y; clear H' || clear H
           end
Level 4: Backtrace:

x is used in conclusion.
Level 4: Backtrace:

x is used in conclusion.
Level 4: Backtrace:

x is used in conclusion.
Level 4: Backtrace:

x is used in conclusion.
Level 4: Backtrace:

x is used in conclusion.
Level 4: Backtrace:

x is used in conclusion.
Level 4: Backtrace:

x is used in conclusion.
Level 3: Backtrace:

x is used in conclusion.