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error[E0499]: cannot borrow `b` as mutable more than once at a time
--> $DIR/mut-cant-alias.rs:9:20
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LL | let b1 = &mut *b;
| - first mutable borrow occurs here
LL | let b2 = &mut *b;
| ^ second mutable borrow occurs here
LL | b1.use_mut();
| -- first borrow later used here
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0499`.
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