avoid breaking change in new Rust versions

[lcnr]

Your crate will unfortunately stop compiling due to changes to compiler internals in rust-lang/rust#119989.

The affected pattern is the following

fn ret_string() -> &'static str {
    let slice = &[];
    
    let temp = if false {
        slice[0]
    } else {
        unsafe { slice.get_unchecked(0) }
        // Fixed by changing it to `*slice.get_unchecked(0)`.
        //
        // This incorrectly equates `slice[0]` of type `&?a` with
        // `slice.get_unchecked(0)` of type `&&?b` where `?a` and `?b`
        // are inference variables which are related via subtyping.
        // This previously resulting in a eager "occurs check" failure, causing
        // us to add an auto-deref step. We now stop to eagerly fail here
        // so the deref has to be added manually.
    };

    temp
}

for more details see rust-lang/rust#119989 (comment)

I apologize for the inconvenience.