[any.assign]

any& operator=(const any& rhs);

Throws: Any exceptions arising from the copy constructor for the contained value.

any& operator=(any&& rhs) noexcept;

Returns: *this.

template<class T>
  any& operator=(T&& rhs);

Constraints: VT is not the same type as any and is_copy_constructible_v<VT> is true.

Throws: Any exception thrown by the selected constructor of VT.

22 General utilities library [utilities]