ho have considered Rule 16 have not suggested that it is directed to the court's control of evidentiary questions arising at tri- al. See, e.g., Nakell, Crimmal Dis- covery for the Defense and the Pro- secution-the Developing Constitu- tional Considerations, 50 N.C.L.Rev. 437, 494-514 (1972); Rezneck The New F