Method back_skip

crates/sre_engine/src/string.rs:81–84

(cursor: &mut StringCursor, n: usize)

    #[inline]
    fn back_skip(cursor: &mut StringCursor, n: usize) {
        cursor.position -= n;
        unsafe { cursor.ptr = cursor.ptr.sub(n) };
    }
}

impl StrDrive for &str {