Shared via Rust Playground

playground.rs

pub struct MyStruct<'a> {
    stuffs: Vec<&'a AnotherStruct>
}

pub struct AnotherStruct {
    some_data: DataStruct
}

pub struct DataStruct {
    number: i32,
    another_number: i32,
    yet_another_number: i32,
    is_cool: bool
}

impl<'a> MyStruct<'a> {
    pub fn do_something(&self, data: DataStruct) {
        for stuff in &self.stuffs {
            if stuff.some_data.is_cool == data.is_cool{
                stuff.some_data = data; // <============== cannot mutably borrow immutable field
                break;
            }
        }
    }
}

fn main(){
    
}