2 Checks for calls to `map` followed by a `count`.
5 It looks suspicious. Maybe `map` was confused with `filter`.
6 If the `map` call is intentional, this should be rewritten
7 using `inspect`. Or, if you intend to drive the iterator to
8 completion, you can just use `for_each` instead.
12 let _ = (0..3).map(|x| x + 2).count();