1 error: unused implementer of `Iterator` that must be used
2 --> $DIR/unused-supertrait.rs:9:5
7 = note: iterators are lazy and do nothing unless consumed
8 note: the lint level is defined here
9 --> $DIR/unused-supertrait.rs:1:9
11 LL | #![deny(unused_must_use)]
14 error: aborting due to previous error