[Issue 11211] Use of uninitialized struct allowed in a subclass

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=11211

--- Comment #4 from mhh <maxhaton at gmail.com> ---
The invalid state thing was me misreading the test case, apologies. 

I have brought up some kind of substrctural types in a meting so who knows if
this behaviour may one day be properly fixed.

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