gcc-you can use this code to learn something about gcc, and inquire further into linux,

				// { dg-do compile }				// Origin: Wolfgang Bangerth 								// PR c++/7348				// Access control for typename in function return type								class Outer {				    template  struct Inner {				        typedef int T;				        T foo ();				    };				  public:				    Outer();				};								template 				typename Outer::Inner::T  Outer::Inner::foo () {				  return 1;				};								template Outer::Inner;