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由 Mazdak Farrokhzad 提交于
Override Cycle::try_fold It's not very pretty, but I believe this is the simplest way to correctly implement `Cycle::try_fold`. The following may seem correct: ```rust loop { acc = self.iter.try_fold(acc, &mut f)?; self.iter = self.orig.clone(); } ``` ...but this loops infinitely in case `self.orig` is empty, as opposed to returning `acc`. So we first have to fully iterate `self.orig` to check whether it is empty or not, and before _that_, we have to iterate the remaining elements of `self.iter`. This should always call `self.orig.clone()` the same amount of times as repeated `next()` calls would. r? @scottmcm
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