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struct Layers
{
    typedef struct Widgets { } Widgets;
 
    virtual void fun(void) 
    {
        struct Widgets w;
    }
 
    Widgets w, x, y, z ;
};
 
int main() { }

prog.cpp: In member function ‘virtual void Layers::fun()’:
prog.cpp:7:16: error: using typedef-name ‘Layers::Widgets’ after ‘struct’
         struct Widgets w;
                ^
prog.cpp:3:32: note: ‘Layers::Widgets’ has a previous declaration here
     typedef struct Widgets { } Widgets;
                                ^
prog.cpp:7:25: error: invalid type in declaration before ‘;’ token
         struct Widgets w;
                         ^
prog.cpp:7:24: warning: unused variable ‘w’ [-Wunused-variable]
         struct Widgets w;
                        ^

Standard output is empty