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error[E0596]: cannot borrow `**layer` as mutable, as it is behind a `&` reference
--> $DIR/issue-115259-suggest-iter-mut.rs:15:65
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LL | self.layers.iter().fold(0, |result, mut layer| result + layer.process())
| --------- ^^^^^ `layer` is a `&` reference, so the data it refers to cannot be borrowed as mutable
| |
| consider changing this binding's type to be: `&mut Box<dyn Layer>`
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help: you may want to use `iter_mut` here
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LL | self.layers.iter_mut().fold(0, |result, mut layer| result + layer.process())
| ~~~~~~~~
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0596`.
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