Goal:
  
  A : Type
  P : nat → A → Type
  p : nat → A → bool
  n : nat
  a : A
  l : list A
  Hp : ∀ (i : nat) (x : A), reflectT (P i x) (p i x)
  IHl : ∀ n : nat, alli p n l → Alli P n l
  ============================
   (alli p n (a :: l) → Alli P n (a :: l))


DEBUG:Going to execute:
<coq-core.plugins.ssreflect::ssrrewrite@0> $1 $2
Level 0: Backtrace:

No matching clauses for match.
Level 0: Backtrace:

No applicable tactic.
Level 0: Backtrace:

No applicable tactic.
Level 0: Backtrace:

No applicable tactic.
Level 0: Backtrace:

No applicable tactic.
Level 0: Backtrace:

No applicable tactic.
Level 0: Backtrace:

No applicable tactic.
Level 0: Backtrace:

No applicable tactic.
Level 1: Backtrace:

No applicable tactic.
Level 0: Backtrace:

No applicable tactic.