
Originally Posted by
Ex-Cyber
I think it's both, sort of. Tense is an issue, but the confusing part is that one of the negatives isn't literally present. The phrase "have yet to <present-tense verb>" substitutes for "haven't yet <past-tense verb>". It doesn't literally contain a negative, but the phrase taken as a whole (idiomatically) acts as a negative. For example, the following two phrases mean the same thing:
"I haven't yet tried Fedora 11"
"I have yet to try Fedora 11"
So it's a double negative whose presence was probably influenced by the choice of tense.