[Issue 13156] `abstract` attribute should be disallowed in `interface`s

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13156

hsteoh at quickfur.ath.cx changed:

           What    |Removed                     |Added
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                 CC|                            |hsteoh at quickfur.ath.cx

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