tests/ui/borrowck/borrowck-anon-fields-struct.rs

   1 // Tests that we are able to distinguish when loans borrow different
   2 // anonymous fields of a tuple vs the same anonymous field.
   3
   4 struct Y(usize, usize);
   5
   6 fn distinct_variant() {
   7     let mut y = Y(1, 2);
   8
   9     let a = match y {
  10         Y(ref mut a, _) => a
  11     };
  12
  13     let b = match y {
  14         Y(_, ref mut b) => b
  15     };
  16
  17     *a += 1;
  18     *b += 1;
  19 }
  20
  21 fn same_variant() {
  22     let mut y = Y(1, 2);
  23
  24     let a = match y {
  25         Y(ref mut a, _) => a
  26     };
  27
  28     let b = match y {
  29         Y(ref mut b, _) => b //~ ERROR cannot borrow
  30     };
  31
  32     *a += 1;
  33     *b += 1;
  34 }
  35
  36 fn main() {
  37 }