anchor.diff:                    | _, (x, Some (Meta tau))::rest ->
                         let t = SS.subst subst x.sort in
                         let v, _, g = new_implicit_var "Instantiation of meta argument" e.pos env t in
  +                      if Env.debug env Options.High then
  +                        BU.print1 "maybe_instantiate: Instantiating meta argument with %s\n"
  +                                (Print.term_to_string v);
                         let mark_meta_implicits tau g =
                             { g with implicits =
                                 List.map (fun imp -> { imp with imp_meta = Some (env, tau) }) g.implicits } in
  
positive.code:                   | _, (x, Some (Implicit dot))::rest ->
                        let t = SS.subst subst x.sort in
                        let v, _, g = new_implicit_var "Instantiation of implicit argument" e.pos env t in
                        let subst = NT(x, v)::subst in
                        let args, bs, subst, g' = aux subst (decr_inst inst_n) rest in
                        (v, Some (Implicit dot))::args, bs, subst, Env.conj_guard g g'
  
negative.code: 
              | _ -> e, t, Env.trivial_guard
         end
    end
  
  (**************************************************************************************)
  (* Generalizing types *)
  