src/test/ui/consts/const-eval/ub-nonnull.rs

   1 // Copyright 2018 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 #![feature(const_transmute)]
  12
  13 use std::mem;
  14 use std::ptr::NonNull;
  15 use std::num::{NonZeroU8, NonZeroUsize};
  16
  17 const NULL_PTR: NonNull<u8> = unsafe { mem::transmute(0usize) };
  18 //~^ ERROR this constant likely exhibits undefined behavior
  19
  20 const NULL_U8: NonZeroU8 = unsafe { mem::transmute(0u8) };
  21 //~^ ERROR this constant likely exhibits undefined behavior
  22 const NULL_USIZE: NonZeroUsize = unsafe { mem::transmute(0usize) };
  23 //~^ ERROR this constant likely exhibits undefined behavior
  24
  25 fn main() {}