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error[E0499]: cannot borrow `y.0` as mutable more than once at a time
--> $DIR/borrowck-anon-fields-tuple.rs:37:10
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LL | (ref mut a, _) => a
| --------- first mutable borrow occurs here
...
LL | (ref mut b, _) => b //~ ERROR cannot borrow
| ^^^^^^^^^ second mutable borrow occurs here
...
LL | }
| - first borrow ends here
error: aborting due to previous error
For more information about this error, try `rustc --explain E0499`.
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