tests/ui/borrowck/borrowck-borrow-overloaded-deref.rs

   1 // Test how overloaded deref interacts with borrows when only
   2 // Deref and not DerefMut is implemented.
   3
   4 use std::ops::Deref;
   5 use std::rc::Rc;
   6
   7 fn deref_imm(x: Rc<isize>) {
   8     let __isize = &*x;
   9 }
  10
  11 fn deref_mut1(x: Rc<isize>) {
  12     let __isize = &mut *x; //~ ERROR cannot borrow
  13 }
  14
  15 fn deref_mut2(mut x: Rc<isize>) {
  16     let __isize = &mut *x; //~ ERROR cannot borrow
  17 }
  18
  19 fn deref_extend<'a>(x: &'a Rc<isize>) -> &'a isize {
  20     &**x
  21 }
  22
  23 fn deref_extend_mut1<'a>(x: &'a Rc<isize>) -> &'a mut isize {
  24     &mut **x //~ ERROR cannot borrow
  25 }
  26
  27 fn deref_extend_mut2<'a>(x: &'a mut Rc<isize>) -> &'a mut isize {
  28     &mut **x //~ ERROR cannot borrow
  29 }
  30
  31 fn assign1<'a>(x: Rc<isize>) {
  32     *x = 3; //~ ERROR cannot assign
  33 }
  34
  35 fn assign2<'a>(x: &'a Rc<isize>) {
  36     **x = 3; //~ ERROR cannot assign
  37 }
  38
  39 fn assign3<'a>(x: &'a mut Rc<isize>) {
  40     **x = 3; //~ ERROR cannot assign
  41 }
  42
  43 pub fn main() {}