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1 ### What it does
2 Checks for usage of `filter_map(|x| x)`.
3
4 ### Why is this bad?
5 Readability, this can be written more concisely by using `flatten`.
6
7 ### Example
8 ```
9 iter.filter_map(|x| x);
10 ```
11 Use instead:
12 ```
13 iter.flatten();
14 ```