src/test/ui/borrowck/borrowck-anon-fields-tuple.stderr

   1 error[E0499]: cannot borrow `y.0` as mutable more than once at a time
   2   --> $DIR/borrowck-anon-fields-tuple.rs:27:10
   3    |
   4 LL |         (ref mut a, _) => a
   5    |          --------- first mutable borrow occurs here
   6 ...
   7 LL |         (ref mut b, _) => b //~ ERROR cannot borrow
   8    |          ^^^^^^^^^ second mutable borrow occurs here
   9 ...
  10 LL | }
  11    | - first borrow ends here
  12
  13 error: aborting due to previous error
  14
  15 For more information about this error, try `rustc --explain E0499`.