pub trait Poly {
fn fmt(&Self, &mut Formatter);
}Format trait for the ? character
fn fmt(&Self, &mut Formatter)impl<T> Poly for T
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).