src/test/ui/interior-mutability/interior-mutability.rs

   1 // Copyright 2016 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 use std::cell::Cell;
  12 use std::panic::catch_unwind;
  13 fn main() {
  14     let mut x = Cell::new(22);
  15     catch_unwind(|| { x.set(23); });
  16     //~^ ERROR the type `std::cell::UnsafeCell<i32>` may contain interior mutability and a
  17 }