[Issue 9779] Improperly implemented interface methods should emit a better diagnostic

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=9779

Basile-z <b2.temp at gmx.com> changed:

           What    |Removed                     |Added
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           Keywords|                            |diagnostic
                 CC|                            |b2.temp at gmx.com

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