Since D100581, Clang started flagging this variable which is set but
never read. Based on comparing this function with __match_at_start_posix_nosubs
(which is very similar), I am pretty confident that `__j` was simply left
behind as an oversight in Howard's
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|---|---|---|
| .. | ||
| rand.adapt | ||
| rand.device | ||
| rand.dis | ||
| rand.eng | ||
| rand.predef | ||
| rand.req | ||
| rand.util | ||