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error[E0499]: cannot borrow `i` as mutable more than once at a time
--> $DIR/E0499.rs:4:17
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LL | let mut x = &mut i;
| ------ first mutable borrow occurs here
LL | let mut a = &mut i;
| ^^^^^^ second mutable borrow occurs here
LL | a.use_mut();
LL | x.use_mut();
| ----------- first borrow later used here
error: aborting due to previous error
For more information about this error, try `rustc --explain E0499`.
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