4 #![allow(unused_variables, blacklisted_name)]
6 use std::collections::HashSet;
9 let tracked_fds: HashSet<i32> = HashSet::new();
10 let new_fds = HashSet::new();
11 let unwanted = &tracked_fds - &new_fds;
15 let bar = String::new();
16 let bar = "foo" == &bar;
18 let a = "a".to_string();