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This commit carries out the request from issue #14678: > The method `Iterator::len()` is surprising, as all the other uses of > `len()` do not consume the value. `len()` would make more sense to be > called `count()`, but that would collide with the current > `Iterator::count(|T| -> bool) -> unit` method. That method, however, is > a bit redundant, and can be easily replaced with > `iter.filter(|x| x < 5).count()`. > After this change, we could then define the `len()` method > on `iter::ExactSize`. Closes #14678. [breaking-change]