rust/tests/ui/borrowck/borrowck-anon-fields-tuple....

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error[E0499]: cannot borrow `y.0` as mutable more than once at a time
--> $DIR/borrowck-anon-fields-tuple.rs:27:10
|
LL | (ref mut a, _) => a
| --------- first mutable borrow occurs here
...
LL | (ref mut b, _) => b
| ^^^^^^^^^ second mutable borrow occurs here
...
LL | *a += 1;
| ------- first borrow later used here
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0499`.