mirror of https://github.com/rust-lang/rust
21 lines
412 B
Rust
21 lines
412 B
Rust
//@ run-rustfix
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#![allow(unused_mut)]
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#![allow(dead_code)]
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pub trait Layer {
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fn process(&mut self) -> u32;
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}
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pub struct State {
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layers: Vec<Box<dyn Layer>>,
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}
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impl State {
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pub fn process(&mut self) -> u32 {
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self.layers.iter().fold(0, |result, mut layer| result + layer.process())
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//~^ ERROR cannot borrow `**layer` as mutable, as it is behind a `&` reference
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}
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}
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fn main() {}
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