Geoff Thorpe 4db73c1bb8 (A version of) gcc had been giving somewhat odd "trigraph" warnings about
this construct, and Ulf provided the following insight as to why;

> ANSI C compliant compilers must substitute "??)" for "]" because your
> terminal might not have a "]" key if you bought it in the early 1970s.

So we escape the final '?' to avoid this pathological case.
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