[Issue 20879] Arrays are oblivious to copy constructors

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20879

--- Comment #1 from Stanislav Blinov <stanislav.blinov at gmail.com> ---
Going to upgrade this to critical, seeing as the spec recommends switching to
copy ctors, whereas neither the compiler nor the runtime are actually ready for
such a switch.

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