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


DEBUG:Going to execute:
Tactics.autoinjection ltac:(Tactics.inject)
Level 4: Backtrace:

Tactic failure (level 2).
Level 4: Backtrace:

Tactic failure (level 1).
Level 3: Backtrace:

Tactic failure (level 1).
Level 2: Backtrace:

Tactic failure.
Level 1: Backtrace:

Tactic failure.
Level 0: Backtrace:

Tactic failure.