2 Checks for the creation of a `peekable` iterator that is never `.peek()`ed
5 Creating a peekable iterator without using any of its methods is likely a mistake,
6 or just a leftover after a refactor.
10 let collection = vec![1, 2, 3];
11 let iter = collection.iter().peekable();
20 let collection = vec![1, 2, 3];
21 let iter = collection.iter();