src/test/compile-fail/issue-17718-const-borrow.rs

   1 // Copyright 2014 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_fn)]
  12
  13 use std::cell::UnsafeCell;
  14
  15 const A: UnsafeCell<usize> = UnsafeCell::new(1);
  16 const B: &'static UnsafeCell<usize> = &A;
  17 //~^ ERROR: cannot borrow a constant which may contain interior mutability
  18
  19 struct C { a: UnsafeCell<usize> }
  20 const D: C = C { a: UnsafeCell::new(1) };
  21 const E: &'static UnsafeCell<usize> = &D.a;
  22 //~^ ERROR: cannot borrow a constant which may contain interior mutability
  23 const F: &'static C = &D;
  24 //~^ ERROR: cannot borrow a constant which may contain interior mutability
  25
  26 fn main() {}