[Issue 23653] New: Interface method not being detected as unimplemented when using abstract class

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23653

          Issue ID: 23653
           Summary: Interface method not being detected as unimplemented
                    when using abstract class
           Product: D
           Version: D2
          Hardware: x86
                OS: All
            Status: NEW
          Severity: critical
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: msnmancini at hotmail.com

```d
interface IScene{void initialize();}
abstract class AScene : IScene{}
class MainScene : AScene{}

void main() 
{
    new MainScene().initialize();
}
```

Really sick, this has been happening for some time with me, it sigsegfaults and
I'm only able to find the error via the debugger.

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