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

   1 // Copyright 2012 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 // revisions: ast mir
  12 //[mir]compile-flags: -Z borrowck=mir
  13
  14 fn main() {
  15     let mut _a = 3;
  16     let b = &mut _a;
  17     {
  18         let c = &*b;
  19         _a = 4; //[ast]~ ERROR cannot assign to `_a`
  20         //[mir]~^ ERROR cannot assign to `_a` because it is borrowed
  21         drop(c);
  22     }
  23     drop(b);
  24 }