Goal:
  
  A : Type
  B : Type
  C : Type
  P : A → B → C → Prop
  p : A → B → C → bool
  a : A
  l : list A
  b : B
  l' : list B
  c : C
  l'' : list C
  Hp : ∀ (x : A) (y : B) (z : C), reflect (P x y z) (p x y z)
  IHl : ∀ (l' : list B) (l'' : list C),
          forallb3 p l l' l'' → Forall3 P l l' l''
  ============================
   (p a b c && forallb3 p l l' l'' → Forall3 P (a :: l) (b :: l') (c :: 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.