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When encountering multiple mutable borrows, suggest cloning and adding derive annotations as needed. ``` error[E0596]: cannot borrow `sm.x` as mutable, as it is behind a `&` reference --> $DIR/accidentally-cloning-ref-borrow-error.rs:32:9 | LL | foo(&mut sm.x); | ^^^^^^^^^ `sm` is a `&` reference, so the data it refers to cannot be borrowed as mutable | help: `Str` doesn't implement `Clone`, so this call clones the reference `&Str` --> $DIR/accidentally-cloning-ref-borrow-error.rs:31:21 | LL | let mut sm = sr.clone(); | ^^^^^^^ help: consider annotating `Str` with `#[derive(Clone)]` | LL + #[derive(Clone)] LL | struct Str { | help: consider specifying this binding's type | LL | let mut sm: &mut Str = sr.clone(); | ++++++++++ ``` ``` error[E0596]: cannot borrow `*inner` as mutable, as it is behind a `&` reference --> $DIR/issue-91206.rs:14:5 | LL | inner.clear(); | ^^^^^ `inner` is a `&` reference, so the data it refers to cannot be borrowed as mutable | help: you can `clone` the `Vec<usize>` value and consume it, but this might not be your desired behavior --> $DIR/issue-91206.rs:11:17 | LL | let inner = client.get_inner_ref(); | ^^^^^^^^^^^^^^^^^^^^^^ help: consider specifying this binding's type | LL | let inner: &mut Vec<usize> = client.get_inner_ref(); | +++++++++++++++++ ``` |
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