Crate doesn't build due to changes to rustc about rust-ascii HOT 1 CLOSED

fn lifetime() {
    let mut text = "some text".to_string();

    let ascii = text.to_ascii().unwrap();
    text.clear();
    drop(text);
    println!("{}", ascii);
}

src/lib.rs:749:9: 749:13 error: cannot borrow `text` as mutable because it is also borrowed as immutable
src/lib.rs:749         text.clear();
                       ^~~~
src/lib.rs:748:21: 748:25 note: previous borrow of `text` occurs here; the immutable borrow prevents subsequent moves or mutable borrows of `text` until the borrow ends
src/lib.rs:748         let ascii = text.to_ascii().unwrap();
                                   ^~~~
src/lib.rs:752:6: 752:6 note: previous borrow ends here
src/lib.rs:745     fn lifetime() {
...
src/lib.rs:752     }
                   ^
src/lib.rs:750:14: 750:18 error: cannot move out of `text` because it is borrowed
src/lib.rs:750         drop(text);
                            ^~~~
src/lib.rs:748:21: 748:25 note: borrow of `text` occurs here
src/lib.rs:748         let ascii = text.to_ascii().unwrap();
                                   ^~~~