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Add arrays as not FFI-safe in other-reprs.md#495

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Add arrays as not FFI-safe in other-reprs.md#495
scimind2460 wants to merge 1 commit intorust-lang:masterfrom
scimind2460:patch-1

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Raw arrays are not FFI-safe, even though they are sized. I think this should be mentioned in the Nomicon.

* DST pointers (wide pointers) and tuples are not a concept
in C, and as such are never FFI-safe.

* Raw arrays of types are not FFI-safe.
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"Raw arrays" is ambiguous, we should explain the situation and what repr(C) does, like other explanations, I think.

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