用于进行gcc测试

				// { dg-do compile }								// Copyright (C) 2003 Free Software Foundation, Inc.				// Contributed by Nathan Sidwell 30 Jul 2003 								// PR 11347. ICE in tsubst								template  struct T1 {				  enum {N};				};								template struct T2 {				  template  struct B {};				  struct C {};				};								T2 t;								T2::B s;