pub unsafe fn position<T>(buf: *T, f: &fn(&T) -> bool) -> uint
Return the first offset i such that f(buf[i]) == true.
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).