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error: this call to `map()` won't have an effect on the call to `count()`
--> $DIR/suspicious_map.rs:4:13
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LL | let _ = (0..3).map(|x| x + 2).count();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: `-D clippy::suspicious-map` implied by `-D warnings`
= help: make sure you did not confuse `map` with `filter` or `for_each`
error: aborting due to previous error
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