[Issue 17876] Internal error with red black tree of array of arrays

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17876

--- Comment #1 from Christian Durán <ovejacuantica at gmail.com> ---
Probably just needs a better error message because it seems to happen because
there's no ordering for the type.

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