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