[Issue 21878] "ref" lost when indexing array in CTFE

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21878

--- Comment #1 from Vladimir Panteleev <dlang-bugzilla at thecybershadow.net> ---
I should add that `inout` is also somehow to blame. Works fine without it.

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