Unsafe-Any 
Convenience traits for unsafe downcasting from trait objects to concrete types.
Overview
This crate defines two new traits UncheckedAnyDowncast and UncheckedAnyMutDowncast,
which define methods for downcasting to any type that implements Any from
implemented trait objects.
It also defines two convenience implementations of these traits for &'a Any
and &'a mut Any, which are the most common trait objects that you might
downcast from.
Example:
let a = box 7u as Box<Any>;
unsafe { assert_eq!(*a.downcast_ref_unchecked::<uint>(), 7u); }License
MIT