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error: avoid using `collect()` when not needed
--> $DIR/ice-5872.rs:4:39
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LL | let _ = vec![1, 2, 3].into_iter().collect::<Vec<_>>().is_empty();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `next().is_none()`
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= note: `-D clippy::needless-collect` implied by `-D warnings`
= help: to override `-D warnings` add `#[allow(clippy::needless_collect)]`
error: aborting due to 1 previous error
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