Doctor C's Pointers

[Superuser]

I was reading the August issue of The C Users Journal and came across
this in Rex Jaeschke's article -

(  The ability to subscript a pointer gives rise to the identity )
(                                                                )
(            a[i] is equivalent to *(a + i)                      )
(                                                                )
(  It also allows expressions such as                            )
(                                                                )
(            "abcd"[i] and f()[j]                                )

                           ^^^^^

I thought this was taboo. What's the story on this?

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