rust-clippy/tests/ui/zero_ptr.rs

// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#[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
}