Goal:
    A : Type  l : list A  hd : A  tl : list A
  ============================
   (Some hd = Some hd ∧ tl = tl)


DEBUG:Going to execute:
solve [ inversion H ]
Level 3: Backtrace:

The type of hd is not inductive.
Level 3: Backtrace:

No applicable tactic.