Goal:
    A : Type  n : nat  H : n < #|[]|
  ============================
   A


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.