[Issue 3774] New: should not be able to implicitly cast to private base class

[d-bugmail]

http://d.puremagic.com/issues/show_bug.cgi?id=3774

           Summary: should not be able to implicitly cast to private base
                    class
           Product: D
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nob...@puremagic.com
        ReportedBy: bugzi...@digitalmars.com


--- Comment #0 from Walter Bright <bugzi...@digitalmars.com> 2010-02-05 
18:05:00 PST ---
It seems I have been testing this with a buggy c++ compiler or 
can't remember what was the problem previously. I now tried with gcc 
4.4.3 and this is how D and C++ differ:

---

class Foo {
  public:
  void bar() {}
};

class Bar : private Foo {
};

int main() {
  Foo *a = new Bar();
  a->bar();
}

test.cpp: In function ‘int main()’:
test.cpp:10: error: ‘Foo’ is an inaccessible base of ‘Bar’

---

module m1;

class Foo {
  public void bar() {}
}

class Bar : private foo {
}

module m2;
import m1;

void main() {
  Foo a = new Bar();
  a.bar();
}

// compiles and runs just fine
// Changing the 'Foo a = ...' into 'Bar a = ...' makes this an error

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