[Issue 15500] 'default construction is disabled for type' even though one should be available with default arg

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15500

--- Comment #4 from Martin Nowak <code at dawg.eu> ---
(In reply to John Colvin from comment #3)
> Am I missing something? I assumed this would just be a straightforward
> "structs cannot have a 0-arg constructor, even by using default arguments",
> regardless of use.

It is build that way, only a warning for now, but something went wrong and now
there is an additional error on usage.

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