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#include <iostream>
 
namespace A
{
    namespace
    {
        bool foo = false;
    }
 
    bool foo = true;
 
    void bar()
    {
        std::cout << foo << '\n';
    }
}
 
int main()
{
    A::bar();
}

prog.cpp: In function ‘void A::bar()’:
prog.cpp:14:22: error: reference to ‘foo’ is ambiguous
         std::cout << foo << '\n';
                      ^
prog.cpp:10:10: note: candidates are: bool A::foo
     bool foo = true;
          ^
prog.cpp:7:14: note:                 bool A::{anonymous}::foo
         bool foo = false;
              ^
prog.cpp: At global scope:
prog.cpp:7:14: warning: ‘A::{anonymous}::foo’ defined but not used [-Wunused-variable]

Standard output is empty