src/test/ui/nll/issue-27868.rs

   1 // Copyright 2018 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 // Regression test for issue #27868
  12
  13 #![feature(nll)]
  14
  15 use std::ops::AddAssign;
  16
  17 struct MyVec<T>(Vec<T>);
  18
  19 impl <T> Drop for MyVec<T> {
  20     fn drop(&mut self) {
  21         println!("Being dropped.");
  22     }
  23 }
  24
  25 impl<T> AddAssign<T> for MyVec<T> {
  26     fn add_assign(&mut self, _elem: T) {
  27         println!("In add_assign.");
  28     }
  29 }
  30
  31 fn main() {
  32     let mut vec = MyVec(vec![0]);
  33     let mut vecvec = vec![vec];
  34
  35     vecvec[0] += {
  36         vecvec = vec![];
  37         //~^ ERROR cannot assign to `vecvec` because it is borrowed [E0506]
  38         0
  39     };
  40 }