File: issue-44405.rs

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rustc 1.85.0%2Bdfsg3-1
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use std::ops::Index;

struct Test;
struct Container(Test);

impl Test {
    fn test(&mut self) {}
}

impl<'a> Index<&'a bool> for Container {
    type Output = Test;

    fn index(&self, _index: &'a bool) -> &Test {
        &self.0
    }
}

fn main() {
    let container = Container(Test);
    let mut val = true;
    container[&mut val].test(); //~ ERROR: cannot borrow data
}