Token mapping no longer works for tokens following a float literal

[jonas-schievink]

macro_rules! constant {
    ($( $ret:expr ; )*) => {
        fn f() {
            $( $ret; )*
        }
    };
}

constant! {
    -0.0;
    KONST;
}

const KONST: () = ();

Here KONST inside the macro doesn't have highlighting or hover (but the macro does expand correctly). Swapping the two lines in the macro makes it work again. Caused by #12149.

[jonas-schievink]

The PR causing this was reverted.