src/test/ui/coercion/coerce-overloaded-autoderef-fail.rs

   1 fn borrow_mut<T>(x: &mut T) -> &mut T { x }
   2 fn borrow<T>(x: &T) -> &T { x }
   3
   4 fn borrow_mut2<T>(_: &mut T, _: &mut T) {}
   5 fn borrow2<T>(_: &mut T, _: &T) {}
   6
   7 fn double_mut_borrow<T>(x: &mut Box<T>) {
   8     let y = borrow_mut(x);
   9     let z = borrow_mut(x);
  10     //~^ ERROR cannot borrow `*x` as mutable more than once at a time
  11     drop((y, z));
  12 }
  13
  14 fn double_imm_borrow(x: &mut Box<i32>) {
  15     let y = borrow(x);
  16     let z = borrow(x);
  17     **x += 1;
  18     //~^ ERROR cannot assign to `**x` because it is borrowed
  19     drop((y, z));
  20 }
  21
  22 fn double_mut_borrow2<T>(x: &mut Box<T>) {
  23     borrow_mut2(x, x);
  24     //~^ ERROR cannot borrow `*x` as mutable more than once at a time
  25 }
  26
  27 fn double_borrow2<T>(x: &mut Box<T>) {
  28     borrow2(x, x);
  29     //~^ ERROR cannot borrow `*x` as mutable because it is also borrowed as immutable
  30 }
  31
  32 pub fn main() {}