Annex D (normative) Compatibility features [depr]

D.9 Implicit declaration of copy functions [depr.impldec]

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.
It is possible that future versions of C++ will specify that these implicit definitions are deleted ([dcl.fct.def.delete]).