[Issue 23556] Array append ignores copy constructor

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23556

--- Comment #3 from Steven Schveighoffer <schveiguy at gmail.com> ---
Yes, the problem is the copying of the existing data.

I can think of a few ways to fix this, but they aren't pretty. We either have
to add more special members to TypeInfo, or change the hook so it can explain
to the runtime how to call the copy constructor.

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