[Issue 2946] Make 'abstract' mandatory if the class is intended to be abstract

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=2946

Dmitry Olshansky <dmitry.olsh at gmail.com> changed:

           What    |Removed                     |Added
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           Keywords|                            |bootcamp
                 CC|                            |dmitry.olsh at gmail.com

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