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error[E0596]: cannot borrow `v` as mutable, as it is not declared as mutable
--> $DIR/issue-33819.rs:4:34
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LL | Some(ref v) => { let a = &mut v; },
| ^^^^^^
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| cannot borrow as mutable
| help: try removing `&mut` here
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0596`.
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