See http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2128r6.pdf
Did we ever discuss this in a liaison group meeting?
While the paper is not proposing to add multi-dimensional subscripting
for raw arrays, it is doing a land grab on what that syntax means.
I got the impression that some WG14 members have different ideas
for that sort of a syntax, based on earlier email discussions.
As far as I understand, the concerns were about comma expressions,
and that ship has sailed with the depreciation in 20.
I suppose C might want to talk about doing something similar there, as that did
technically include an incompatibility.
To my knowledge, none of the authors has been reached about further C
compatibility concerns.
And as you are pointing out, this proposal does not affect C arrays.
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