[Issue 23240] dmd compiles 'ok' class invalid to interface if class contains abstract members

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23240

--- Comment #3 from Alexey <animuspexus at protonmail.com> ---
looks like this bug is related to those bugs

https://issues.dlang.org/show_bug.cgi?id=21321
https://issues.dlang.org/show_bug.cgi?id=21184

basically, I've simply searched by 'abstract word' and there are looks like
more related  bugs.

--