[Issue 18886] Explicitly invoking super.__ctor in a constructor does not count as calling a super constructor

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18886

--- Comment #5 from Adam D. Ruppe <destructionator at gmail.com> ---
errr and also while we're at it, perhaps calling `this!(args)` as well, for
forwarding to another ctor in the same class.

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