用于进行gcc测试

				// PR c++/27000				// Implicitly instantiated templates should not be affected by				// #pragma visibility.								/* { dg-do compile } */				/* { dg-require-visibility "" } */				/* { dg-final { scan-not-hidden "_ZN1SIiED1Ev" } } */				/* { dg-final { scan-not-hidden "_ZN1SIiEC1ERKi" } } */								template 				struct S				{				  S (const T &);				  ~S ();				  T t;				};								template 				S::S (const T &x)				{				  t = x;				}								template 				S::~S ()				{				}								#pragma GCC visibility push(hidden)				struct U				{				  S s;				  U () : s (6) { }				} u;				#pragma GCC visibility pop