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#include <iostream>
#include <algorithm>
 
namespace foo
{
    struct Bar
    {
        int data;
    };
 
    void init(Bar& bar)
    {
        bar.data = 42;
    }
}
 
void init(foo::Bar& bar)
{
    bar.data = 777;
}
 
int main()
{
    foo::Bar bar;
    init(bar) // Error! call of overloaded 'init(foo::Bar&)' is ambiguous.
 
    std::cout << bar.data << std::endl;
 
    return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:25:13: error: call of overloaded ‘init(foo::Bar&)’ is ambiguous
     init(bar) // Error! call of overloaded 'init(foo::Bar&)' is ambiguous.
             ^
prog.cpp:17:6: note: candidate: void init(foo::Bar&)
 void init(foo::Bar& bar)
      ^~~~
prog.cpp:11:10: note: candidate: void foo::init(foo::Bar&)
     void init(Bar& bar)
          ^~~~

Standard output is empty