[Issue 24892] We need a __traits trait to test for whether one class is derived from another

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24892

--- Comment #6 from Dennis <dkorpel at live.nl> ---
So you're unable to provide a single real and concrete code example. That's a
shame, because I'm suspicious of those cases where people ask how to check if
one class is derived from another, it sounds like classic XY problem.
(https://en.wikipedia.org/wiki/XY_problem)

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