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error[E0502]: cannot borrow `*a` as mutable because it is also borrowed as immutable
--> $DIR/E0502.rs:4:5
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LL | let ref y = a;
| ----- immutable borrow occurs here
LL | bar(a);
| ^^^^^^ mutable borrow occurs here
LL | y.use_ref();
| ----------- immutable borrow later used here
error: aborting due to previous error
For more information about this error, try `rustc --explain E0502`.
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