src/test/ui/typeck/assign-non-lval-mut-ref.stderr

   1 error[E0070]: invalid left-hand side of assignment
   2   --> $DIR/assign-non-lval-mut-ref.rs:5:27
   3    |
   4 LL |     x.last_mut().unwrap() = 2;
   5    |     --------------------- ^
   6    |     |
   7    |     cannot assign to this expression
   8    |
   9 help: consider dereferencing here to assign to the mutably borrowed value
  10    |
  11 LL |     *x.last_mut().unwrap() = 2;
  12    |     +
  13
  14 error[E0368]: binary assignment operation `+=` cannot be applied to type `&mut usize`
  15   --> $DIR/assign-non-lval-mut-ref.rs:7:5
  16    |
  17 LL |     x.last_mut().unwrap() += 1;
  18    |     ---------------------^^^^^
  19    |     |
  20    |     cannot use `+=` on type `&mut usize`
  21    |
  22 help: `+=` can be used on `usize` if you dereference the left-hand side
  23    |
  24 LL |     *x.last_mut().unwrap() += 1;
  25    |     +
  26
  27 error[E0308]: mismatched types
  28   --> $DIR/assign-non-lval-mut-ref.rs:11:9
  29    |
  30 LL |     let y = x.last_mut().unwrap();
  31    |             --------------------- expected due to this value
  32 LL |     y = 2;
  33    |         ^ expected `&mut usize`, found integer
  34    |
  35 help: consider dereferencing here to assign to the mutably borrowed value
  36    |
  37 LL |     *y = 2;
  38    |     +
  39
  40 error[E0368]: binary assignment operation `+=` cannot be applied to type `&mut usize`
  41   --> $DIR/assign-non-lval-mut-ref.rs:13:5
  42    |
  43 LL |     y += 1;
  44    |     -^^^^^
  45    |     |
  46    |     cannot use `+=` on type `&mut usize`
  47    |
  48 help: `+=` can be used on `usize` if you dereference the left-hand side
  49    |
  50 LL |     *y += 1;
  51    |     +
  52
  53 error: aborting due to 4 previous errors
  54
  55 Some errors have detailed explanations: E0070, E0308, E0368.
  56 For more information about an error, try `rustc --explain E0070`.