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digitalmars.D.bugs - [Issue 9653] New: Wrong implicit cast allowed with inheritance

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=9653

           Summary: Wrong implicit cast allowed with inheritance
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: accepts-invalid
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: k.hara.pg gmail.com


--- Comment #0 from Kenji Hara <k.hara.pg gmail.com> 2013-03-05 16:53:33 PST ---
C1.foo correctly reports error with wrong implicit conversion from TypeInfo to
inout(TypeInfo), but C2.foo doesn't.

class B {
    inout(TypeInfo) foo() nothrow pure inout {
        return null;
    }
}
class C1 {
    /*override*/ inout(TypeInfo) foo() inout {
        return typeid(Object);  // error, correct
    }
}
class C2 : B {
    override inout(TypeInfo) foo() inout {
        return typeid(Object);  // no error, BUG
    }
}

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parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=9653


Henning Pohl <henning still-hidden.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |henning still-hidden.de


--- Comment #1 from Henning Pohl <henning still-hidden.de> 2013-07-28 14:14:44
PDT ---
Reduced:

class C {
    inout(TypeInfo) foo() pure inout {
        return typeid(Object);
    }
}

The problem is that by using typeid(Object) you can get access to a global
class instance (TypeInfo) in a pure function. And the result of pure functions
can be casted to be inout. But in this case you didn't create the class
instance by yourself. So only self-created TypeInfo-instances should be allowed
to get casted. These are hard to detect though.

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Jul 28 2013