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error[E0596]: cannot borrow `x.0` as mutable, as `x` is not declared as mutable
--> $DIR/borrowck-ref-mut-of-imm.rs:4:12
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LL | fn destructure(x: Option<isize>) -> isize {
| - help: consider changing this to be mutable: `mut x`
...
LL | Some(ref mut v) => *v
| ^^^^^^^^^ cannot borrow as mutable
error: aborting due to previous error
For more information about this error, try `rustc --explain E0596`.
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