It'd be great to offer every method that the sequential Iterator trait does (presuming they make sense in a parallel context). This milestone tracks the progress towards that goal. Each issue has a description of how to fix it: if something is unclear, please ask!

You can see some notes on the "Iterator Trait Parity" wiki page that track the full set of methods. Some methods are deemed not applicable. Others don't have issues because the best path is not clear, or nobody wrote it up.