Goal:
    a : byte  b : byte  H : NoConfusion_byte a b
  ============================
   (a = b)


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

a is used in conclusion.
Level 4: Backtrace:

a is used in conclusion.
Level 4: Backtrace:

a is used in conclusion.
Level 4: Backtrace:

a is used in conclusion.
Level 4: Backtrace:

a is used in conclusion.
Level 4: Backtrace:

a is used in conclusion.
Level 4: Backtrace:

a is used in conclusion.
Level 3: Backtrace:

a is used in conclusion.