[Issue 13506] @safe cartesianProduct.array

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13506

--- Comment #2 from hsteoh at quickfur.ath.cx ---
Oh, and just to be clear, this particular instantiation of emplaceRef is
un- at safe because it eventually takes the address of an item and calls memcpy on
it. It's not caused by something in cartesianProduct range being non- at safe.

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