rust/src/test/compile-fail/borrowck-imm-ref-to-mut-rec-field-issue-3162-c.rs

// Copyright 2012 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.

fn main() {
    let mut _a = 3;
    let _b = &mut _a;
    {
        let _c = &*_b;
        _a = 4; //~ ERROR cannot assign to `_a`
    }
}