Test `expect` with `forbid` and fix doc errors (RFC-2383)

[rust.git] / src / test / ui / did_you_mean / issue-40823.rs

fn main() {
    let mut buf = &[1, 2, 3, 4];
    buf.iter_mut(); //~ ERROR cannot borrow `*buf` as mutable, as it is behind a `&` reference
}