Bug 19334 – Derived class inheritance private members in same module

import std.stdio; class A { package int x; private int y; } class B : A { }; void main() { B b = new B(); b.y = 1; // Should be a compile error writeln(b.y); writeln(b.x); } Remove "package int x" and it works as intended.

Scratch that, it still accepts invalid code even package int x is removed. Class b shouldn't have property y, as property y only exist at class A not class B. import std.stdio; class A { private int y; } class B : A { }; void main() { B b = new B(); b.y = 1; // Should be a compile error as class shouldn't have private int y. writeln(b.y); }

This is not a bug and is working as intended: "Symbols with private visibility can only be accessed from within the same module." https://dlang.org/spec/attribute.html#visibility_attributes

"This is not a bug and is working as intended" I strongly disagree with that notation.

The unit of encapsulation in D is the module. If you absolutely positively can't live with access to private members in the same module, then keep your classes in separate modules under the same package namespace.

This isn't about encapsulation, this is about inheritance. Class B should NOT inherent Class A private members, irregardless of in the same module or not. Period. If you want me to write a DIP on deprecating this behavior I would gladly do so.