Using a mixin as private method to a class makes it inaccessible to
anything else within the class.

test.d(8): class test.Foo test.Foo.Mixfunc!() Mixfunc_.func is private


template Mixfunc()
{
    void func(){}
}

class Foo
{
private:
    mixin Mixfunc;

    void somefunc(){func();}
public:
    this(){somefunc();}
    ~this(){}
}

int main()
{
    Foo t=new Foo;
    return 1;
}