clippy 0.0.155

A bunch of helpful lints to avoid common pitfalls in Rust
Documentation 
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#![feature(plugin)]
#![plugin(clippy)]

#[allow(unused_variables)]
fn main() {
    let x = 0 as *const usize;
    let y = 0 as *mut f64;

    let z = 0;
    let z = z as *const usize; // this is currently not caught
}