When launching "Create Implementation" on a class, if a special function (constructors / destructor) is defaulted not within the class declaration but outside then VAX does not detect that the implementation is already defined.
In the following code, both constructors are defined: the default constructor is defaulted in the .cpp and the copy constructor is defaulted within the class declaration. So normally VAX shouldn't propose any "Create Implementation" but it still propose to create the default constructor which is a bug.
Dummy(const Dummy&) = default;
Dummy::Dummy() = default;