Annex D (normative) Compatibility features [depr]

The implicit definition of a copy constructor as defaulted is deprecated if the class has a user-declared copy assignment operator or a user-declared destructor.

The implicit definition of a copy assignment operator as defaulted is deprecated if the class has a user-declared copy constructor or a user-declared destructor.

In a future revision of C++, these implicit definitions could become deleted ([dcl.fct.def.delete]).