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14feb3670f
This change adds a lint to check for instances of `map(..).flatten()` that can be trivially shortened to `flat_map(..)` Closes #3196
10 lines
491 B
Text
10 lines
491 B
Text
error: called `map(..).flatten()` on an `Iterator`. This is more succinctly expressed by calling `.flat_map(..)`
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--> $DIR/map_flatten.rs:6:21
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6 | let _: Vec<_> = vec![5_i8; 6].into_iter().map(|x| 0..x).flatten().collect();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using flat_map instead: `vec![5_i8; 6].into_iter().flat_map(|x| 0..x)`
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= note: `-D clippy::map-flatten` implied by `-D warnings`
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error: aborting due to previous error
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