fn main() {
    let x: &i32;
    //x; // error: use of possibly uninitialized variable: `x`
    println!("{:?}", x as *const _);
}This is accepted and prints 0x0 everywhere I've tested (rustc 0.13.0-dev (496dc4e) and the playpen).  A similar access is allowed to moved values and mutably borrowed values.
I assume I should not be able to access uninitialized values without some unsafe code, although I am new to the language and might be missing something.