rust/tests/ui/invalid_ref.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)]
#![feature(core_intrinsics)]

extern crate core;
use std::intrinsics::{init, uninit};

fn main() {
    let x = 1;
    unsafe {
        ref_to_zeroed_std(&x);
        ref_to_zeroed_core(&x);
        ref_to_zeroed_intr(&x);
        ref_to_uninit_std(&x);
        ref_to_uninit_core(&x);
        ref_to_uninit_intr(&x);
        some_ref();
        std_zeroed_no_ref();
        core_zeroed_no_ref();
        intr_init_no_ref();
    }
}

unsafe fn ref_to_zeroed_std<T: ?Sized>(t: &T) {
    let ref_zero: &T = std::mem::zeroed(); // warning
}

unsafe fn ref_to_zeroed_core<T: ?Sized>(t: &T) {
    let ref_zero: &T = core::mem::zeroed(); // warning
}

unsafe fn ref_to_zeroed_intr<T: ?Sized>(t: &T) {
    let ref_zero: &T = std::intrinsics::init(); // warning
}

unsafe fn ref_to_uninit_std<T: ?Sized>(t: &T) {
    let ref_uninit: &T = std::mem::uninitialized(); // warning
}

unsafe fn ref_to_uninit_core<T: ?Sized>(t: &T) {
    let ref_uninit: &T = core::mem::uninitialized(); // warning
}

unsafe fn ref_to_uninit_intr<T: ?Sized>(t: &T) {
    let ref_uninit: &T = std::intrinsics::uninit(); // warning
}

fn some_ref() {
    let some_ref = &1;
}

unsafe fn std_zeroed_no_ref() {
    let mem_zero: usize = std::mem::zeroed(); // no warning
}

unsafe fn core_zeroed_no_ref() {
    let mem_zero: usize = core::mem::zeroed(); // no warning
}

unsafe fn intr_init_no_ref() {
    let mem_zero: usize = std::intrinsics::init(); // no warning
}