src/test/ui/nll/issue-30104.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 #30104
  12
  13 // compile-pass
  14
  15 #![feature(nll)]
  16
  17 use std::ops::{Deref, DerefMut};
  18
  19 fn box_two_field(v: &mut Box<(i32, i32)>) {
  20     let _a = &mut v.0;
  21     let _b = &mut v.1;
  22 }
  23
  24 fn box_destructure(v: &mut Box<(i32, i32)>) {
  25     let (ref mut _head, ref mut _tail) = **v;
  26 }
  27
  28 struct Wrap<T>(T);
  29
  30 impl<T> Deref for Wrap<T> {
  31     type Target = T;
  32     fn deref(&self) -> &T {
  33         &self.0
  34     }
  35 }
  36
  37 impl<T> DerefMut for Wrap<T> {
  38     fn deref_mut(&mut self) -> &mut T {
  39         &mut self.0
  40     }
  41 }
  42
  43 fn smart_two_field(v: &mut Wrap<(i32, i32)>) {
  44     let _a = &mut v.0;
  45     let _b = &mut v.1;
  46 }
  47
  48 fn smart_destructure(v: &mut Wrap<(i32, i32)>) {
  49     let (ref mut _head, ref mut _tail) = **v;
  50 }
  51
  52 fn main() {}