Processing list of tokens #79

Thanks for the library, I have a more of a question and less of an issue.

What is the idiomatic way of processing a list of tokens, discarding tokens that don't pass some test?

I see in the documentation the test_item parser for the testing but how do I go about skipping an item? The skip parser requires to tell it what to skip, I just want to discard the item all together and move to the next.

Thanks