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-### What it does
-Checks for usages of `Iterator::flat_map()` where `filter_map()` could be
-used instead.
-
-### Why is this bad?
-When applicable, `filter_map()` is more clear since it shows that
-`Option` is used to produce 0 or 1 items.
-
-### Example
-```
-let nums: Vec<i32> = ["1", "2", "whee!"].iter().flat_map(|x| x.parse().ok()).collect();
-```
-Use instead:
-```
-let nums: Vec<i32> = ["1", "2", "whee!"].iter().filter_map(|x| x.parse().ok()).collect();
-```
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