pub fn task_rng() -> @mut IsaacRng
Gives back a lazily initialized task-local random number generator,
seeded by the system. Intended to be used in method chaining style, ie
task_rng().gen::<int>().
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).