type WordIterator<'self> = Filter<'self, &'self str, CharSplitIterator<'self, fn(char) -> bool>>;
An iterator over the words of a string, separated by an sequence of whitespace
Prefix searches with a type followed by a colon (e.g.
fn:) to restrict the search to a given type.
Accepted types are: fn, mod,
struct (or str), enum,
trait, typedef (or
tdef).