3 #![warn(clippy::manual_filter_map)]
4 #![allow(clippy::redundant_closure)] // FIXME suggestion may have redundant closure
8 let _ = (0..).filter_map(|a| to_opt(a));
10 // ref pattern, expect()
11 let _ = (0..).filter_map(|a| to_opt(a));
13 // is_ok(), unwrap_or()
14 let _ = (0..).filter_map(|a| to_res(a).ok());
19 let _ = (0..).filter(|n| *n > 1).map(|n| n + 1);
21 // very close but different since filter() provides a reference
22 let _ = (0..).filter(|n| to_opt(n).is_some()).map(|a| to_opt(a).unwrap());
24 // similar but different
25 let _ = (0..).filter(|n| to_opt(n).is_some()).map(|n| to_res(n).unwrap());
27 .filter(|n| to_opt(n).map(|n| n + 1).is_some())
28 .map(|a| to_opt(a).unwrap());
31 fn to_opt<T>(_: T) -> Option<T> {
35 fn to_res<T>(_: T) -> Result<T, ()> {
39 struct Issue8920<'a> {
40 option_field: Option<String>,
41 result_field: Result<String, ()>,
42 ref_field: Option<&'a usize>,
46 let mut vec = vec![Issue8920 {
47 option_field: Some(String::from("str")),
48 result_field: Ok(String::from("str")),
54 .filter_map(|f| f.option_field.clone());
58 .filter_map(|f| f.ref_field.cloned());
62 .filter_map(|f| f.ref_field.copied());
66 .filter_map(|f| f.result_field.clone().ok());
70 .filter_map(|f| f.result_field.as_ref().ok());
74 .filter_map(|f| f.result_field.as_deref().ok());
78 .filter_map(|f| f.result_field.as_mut().ok());
82 .filter_map(|f| f.result_field.as_deref_mut().ok());
86 .filter_map(|f| f.result_field.to_owned().ok());