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error[E0596]: cannot borrow `*container` as mutable, as it is behind a `&` reference
--> $DIR/issue-62387-suggest-iter-mut-2.rs:30:45
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LL | vec.iter().flat_map(|container| container.things()).cloned().collect::<Vec<PathBuf>>();
| --------- ^^^^^^^^^ `container` is a `&` reference, so the data it refers to cannot be borrowed as mutable
| |
| consider changing this binding's type to be: `&mut Container`
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help: you may want to use `iter_mut` here
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LL | vec.iter_mut().flat_map(|container| container.things()).cloned().collect::<Vec<PathBuf>>();
| ~~~~~~~~
error: aborting due to previous error
For more information about this error, try `rustc --explain E0596`.
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