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class SomeClass
{
public:
    struct Test{};
};
 
class Test:public SomeClass::Test{};
 
class FirstParent:public Test
{
public:
    //тут работает
    Test*test(){return nullptr;}
};
 
class SecondParent:public Test
{
public:
    //тут работает
    Test*test(){return nullptr;}
};
 
class Child:public FirstParent,public SecondParent
{
public:
    //а тут не работает
    Test*test(){return nullptr;}
};
 
int main()
{
	return 0;
}

prog.cpp:27:5: error: reference to ‘Test’ is ambiguous
     Test*test(){return nullptr;}
     ^~~~
prog.cpp:4:16: note: candidates are: struct SomeClass::Test SomeClass::Test::Test
     struct Test{};
                ^
prog.cpp:7:34: note:                 class Test Test::Test
 class Test:public SomeClass::Test{};
                                  ^

Standard output is empty