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template<class Class, int Class::*dataMember>
struct Reflect
{
	operator int() {return 0;}
};
 
class Foo
{
public:
	int bar = Reflect<Foo, &Foo::bar>{};
};
 

prog.cpp:10:26: error: extra qualification 'Foo::' on member 'bar' [-fpermissive]
  int bar = Reflect<Foo, &Foo::bar>{};
                          ^
prog.cpp:10:31: error: expected ';' at end of member declaration
  int bar = Reflect<Foo, &Foo::bar>{};
                               ^
prog.cpp:10:31: error: redeclaration of 'int& Foo::bar'
prog.cpp:10:31: note: previous declaration 'int Foo::bar'
prog.cpp:10:34: error: expected unqualified-id before '>' token
  int bar = Reflect<Foo, &Foo::bar>{};
                                  ^
prog.cpp:10:20: error: wrong number of template arguments (1, should be 2)
  int bar = Reflect<Foo, &Foo::bar>{};
                    ^
prog.cpp:2:8: error: provided for 'template<class Class, int Class::* dataMember> struct Reflect'
 struct Reflect
        ^

Standard output is empty