Goal:
  
  A : Type
  eos : CoreTactics.end_of_section
  fix_0 : ∀ (l : list A) (H : ∀ x : A, In x l → bool),
            forallb_InP_graph l H (forallb_InP l H)
  ============================
   (∀ (l : list A) (H : ∀ x : A, In x l → bool),
      forallb_InP_graph l H (forallb_InP l H))


DEBUG:Going to execute:
PTRDEBUGTACrepeat specialize_mutual