用于进行gcc测试

				// { dg-do assemble  }				// Test resolution of templatized overloaded constructors.				// The more specialized constructor, i.e., A (const B &b)				// should be chosen per \S 14.5.5.2/2 [temp.func.order/2].								template 				struct B {				  int f;				};								struct A {				  template 				  A (const B &b) {}								  template 				  A (const T &b) {}				};								int				main ()				{				  B b;				  A a (b);				  return 0;				}