I would by the way argue that the statement "The queue macros always
guaranteed that traversal was safe in the presence of deletions" to be
false. Nowhere was this guaranteed, in fact the Manual page goes to
lengths to NOT do this..
I'm fairly certain that this *was* documented somewhere, at some point
in time, although I can't find it in rev. 1.1 of either the
documentation or the code. Perhaps it was in a book (Stevens 2?).
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