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


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// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// 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.

#![feature(const_transmute)]
#![allow(const_err)] // make sure we cannot allow away the errors tested here

use std::mem;

const BAD_UPVAR: &FnOnce() = &{ //~ ERROR it is undefined behavior to use this value
    let bad_ref: &'static u16 = unsafe { mem::transmute(0usize) };
    let another_var = 13;
    move || { let _ = bad_ref; let _ = another_var; }
};

fn main() {}