rust/tests/ui/borrowck/issue-85765-closure.rs

fn main() {
    let _ = || {
        let mut test = Vec::new();
        let rofl: &Vec<Vec<i32>> = &mut test;
        //~^ HELP consider changing this binding's type
        //~| HELP you can `clone` the `Vec<Vec<i32>>` value and consume it, but this might not be your desired behavior
        rofl.push(Vec::new());
        //~^ ERROR cannot borrow `*rofl` as mutable, as it is behind a `&` reference
        //~| NOTE `rofl` is a `&` reference, so the data it refers to cannot be borrowed as mutable

        let mut mutvar = 42;
        let r = &mutvar;
        //~^ HELP consider changing this to be a mutable reference
        *r = 0;
        //~^ ERROR cannot assign to `*r`, which is behind a `&` reference
        //~| NOTE `r` is a `&` reference, so the data it refers to cannot be written

        #[rustfmt::skip]
        let x: &usize = &mut{0};
        //~^ HELP consider changing this binding's type
        *x = 1;
        //~^ ERROR cannot assign to `*x`, which is behind a `&` reference
        //~| NOTE `x` is a `&` reference, so the data it refers to cannot be written

        #[rustfmt::skip]
        let y: &usize = &mut(0);
        //~^ HELP consider changing this binding's type
        *y = 1;
        //~^ ERROR cannot assign to `*y`, which is behind a `&` reference
        //~| NOTE `y` is a `&` reference, so the data it refers to cannot be written
    };
}