用于进行gcc测试

				// { dg-do compile }								// Copyright (C) 2003 Free Software Foundation, Inc.				// Contributed by Wolfgang Bangerth  20 Feb 2003.								// PR c++/9778.  Ensure templated functions in other namespaces are				// correctly instantiated.								namespace NS {				  template  void foo ();				}								template  struct X {				  int m;				  void g () {				    NS::foo();				  }				};								template class X;