src/tools/clippy/tests/ui/manual_find_map.fixed

   1 // run-rustfix
   2 #![allow(dead_code)]
   3 #![warn(clippy::manual_find_map)]
   4 #![allow(clippy::redundant_closure)] // FIXME suggestion may have redundant closure
   5
   6 fn main() {
   7     // is_some(), unwrap()
   8     let _ = (0..).find_map(|a| to_opt(a));
   9
  10     // ref pattern, expect()
  11     let _ = (0..).find_map(|a| to_opt(a));
  12
  13     // is_ok(), unwrap_or()
  14     let _ = (0..).find_map(|a| to_res(a).ok());
  15 }
  16
  17 fn no_lint() {
  18     // no shared code
  19     let _ = (0..).filter(|n| *n > 1).map(|n| n + 1);
  20
  21     // very close but different since filter() provides a reference
  22     let _ = (0..).find(|n| to_opt(n).is_some()).map(|a| to_opt(a).unwrap());
  23
  24     // similar but different
  25     let _ = (0..).find(|n| to_opt(n).is_some()).map(|n| to_res(n).unwrap());
  26     let _ = (0..)
  27         .find(|n| to_opt(n).map(|n| n + 1).is_some())
  28         .map(|a| to_opt(a).unwrap());
  29 }
  30
  31 fn to_opt<T>(_: T) -> Option<T> {
  32     unimplemented!()
  33 }
  34
  35 fn to_res<T>(_: T) -> Result<T, ()> {
  36     unimplemented!()
  37 }
  38
  39 struct Issue8920<'a> {
  40     option_field: Option<String>,
  41     result_field: Result<String, ()>,
  42     ref_field: Option<&'a usize>,
  43 }
  44
  45 fn issue_8920() {
  46     let mut vec = vec![Issue8920 {
  47         option_field: Some(String::from("str")),
  48         result_field: Ok(String::from("str")),
  49         ref_field: Some(&1),
  50     }];
  51
  52     let _ = vec
  53         .iter()
  54         .find_map(|f| f.option_field.clone());
  55
  56     let _ = vec
  57         .iter()
  58         .find_map(|f| f.ref_field.cloned());
  59
  60     let _ = vec
  61         .iter()
  62         .find_map(|f| f.ref_field.copied());
  63
  64     let _ = vec
  65         .iter()
  66         .find_map(|f| f.result_field.clone().ok());
  67
  68     let _ = vec
  69         .iter()
  70         .find_map(|f| f.result_field.as_ref().ok());
  71
  72     let _ = vec
  73         .iter()
  74         .find_map(|f| f.result_field.as_deref().ok());
  75
  76     let _ = vec
  77         .iter_mut()
  78         .find_map(|f| f.result_field.as_mut().ok());
  79
  80     let _ = vec
  81         .iter_mut()
  82         .find_map(|f| f.result_field.as_deref_mut().ok());
  83
  84     let _ = vec
  85         .iter()
  86         .find_map(|f| f.result_field.to_owned().ok());
  87 }