https://issues.dlang.org/show_bug.cgi?id=22232

          Issue ID: 22232
           Summary: implementing interface function by inheriting from
                    other class
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: animuspexus@protonmail.com

asked at Discord and at Forum, but nobody could tell if this is a bug:
```D
interface Int
{
    void coolFunc();
}

class C1
{
    void coolFunc()
    {
        return;
    }
}

class C2 : C1, Int
{

}

void main()
{
    auto c = new C2;
}
```
dmd ends with error:
t.d(14): Error: class t.C2 interface function void coolFunc() is not
implemented

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