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namespace foo {
    namespace foo {
        typedef int Foo;
    }
    struct Foo {
        int x;
        Foo( foo::Foo const& o ):x(o.x) {}
        void test() {
            Foo f( 7 );
        }
    };
}
 
int main() {
    foo::Foo f;
    f.test();
}

prog.cpp: In constructor ‘foo::Foo::Foo(const Foo&)’:
prog.cpp:7:38: error: request for member ‘x’ in ‘o’, which is of non-class type ‘const Foo {aka const int}’
prog.cpp: In function ‘int main()’:
prog.cpp:15:14: error: no matching function for call to ‘foo::Foo::Foo()’
prog.cpp:15:14: note: candidates are:
prog.cpp:7:9: note: foo::Foo::Foo(const Foo&)
prog.cpp:7:9: note:   candidate expects 1 argument, 0 provided
prog.cpp:5:12: note: constexpr foo::Foo::Foo(const foo::Foo&)
prog.cpp:5:12: note:   candidate expects 1 argument, 0 provided
prog.cpp:5:12: note: constexpr foo::Foo::Foo(foo::Foo&&)
prog.cpp:5:12: note:   candidate expects 1 argument, 0 provided

Standard output is empty