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error[E0596]: cannot borrow `*test` as mutable, as it is behind a `&` reference
--> $DIR/suggest-mut-iterator.rs:22:9
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LL | for test in &tests {
| ------ this iterator yields `&` references
LL | test.add(2);
| ^^^^ `test` is a `&` reference, so the data it refers to cannot be borrowed as mutable
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help: use a mutable iterator instead
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LL | for test in &mut tests {
| +++
error: aborting due to previous error
For more information about this error, try `rustc --explain E0596`.
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