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