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

   1 // run-rustfix
   2
   3 #![warn(clippy::manual_map)]
   4 #![allow(
   5     clippy::no_effect,
   6     clippy::map_identity,
   7     clippy::unit_arg,
   8     clippy::match_ref_pats,
   9     clippy::redundant_pattern_matching,
  10     clippy::for_loops_over_fallibles,
  11     dead_code
  12 )]
  13
  14 fn main() {
  15     Some(0).map(|_| 2);
  16
  17     Some(0).map(|x| x + 1);
  18
  19     Some("").map(|x| x.is_empty());
  20
  21     Some(0).map(|x| !x);
  22
  23     #[rustfmt::skip]
  24     Some(0).map(std::convert::identity);
  25
  26     Some(&String::new()).map(|x| str::len(x));
  27
  28     match Some(0) {
  29         Some(x) if false => Some(x + 1),
  30         _ => None,
  31     };
  32
  33     Some([0, 1]).as_ref().map(|x| x[0]);
  34
  35     Some(0).map(|x| x * 2);
  36
  37     Some(String::new()).as_ref().map(|x| x.is_empty());
  38
  39     Some(String::new()).as_ref().map(|x| x.len());
  40
  41     Some(0).map(|x| x + x);
  42
  43     #[warn(clippy::option_map_unit_fn)]
  44     match &mut Some(String::new()) {
  45         Some(x) => Some(x.push_str("")),
  46         None => None,
  47     };
  48
  49     #[allow(clippy::option_map_unit_fn)]
  50     {
  51         Some(String::new()).as_mut().map(|x| x.push_str(""));
  52     }
  53
  54     Some(String::new()).as_ref().map(|x| x.len());
  55
  56     Some(String::new()).as_ref().map(|x| x.is_empty());
  57
  58     Some((0, 1, 2)).map(|(x, y, z)| x + y + z);
  59
  60     Some([1, 2, 3]).map(|[first, ..]| first);
  61
  62     Some((String::new(), "test")).as_ref().map(|(x, y)| (y, x));
  63
  64     match Some((String::new(), 0)) {
  65         Some((ref x, y)) => Some((y, x)),
  66         None => None,
  67     };
  68
  69     match Some(Some(0)) {
  70         Some(Some(_)) | Some(None) => Some(0),
  71         None => None,
  72     };
  73
  74     match Some(Some((0, 1))) {
  75         Some(Some((x, 1))) => Some(x),
  76         _ => None,
  77     };
  78
  79     // #6795
  80     fn f1() -> Result<(), ()> {
  81         let _ = match Some(Ok(())) {
  82             Some(x) => Some(x?),
  83             None => None,
  84         };
  85         Ok(())
  86     }
  87
  88     for &x in Some(Some(true)).iter() {
  89         let _ = match x {
  90             Some(x) => Some(if x { continue } else { x }),
  91             None => None,
  92         };
  93     }
  94
  95     // #6797
  96     let x1 = (Some(String::new()), 0);
  97     let x2 = x1.0;
  98     match x2 {
  99         Some(x) => Some((x, x1.1)),
 100         None => None,
 101     };
 102
 103     struct S1 {
 104         x: Option<String>,
 105         y: u32,
 106     }
 107     impl S1 {
 108         fn f(self) -> Option<(String, u32)> {
 109             match self.x {
 110                 Some(x) => Some((x, self.y)),
 111                 None => None,
 112             }
 113         }
 114     }
 115
 116     // #6811
 117     Some(0).map(|x| vec![x]);
 118
 119     option_env!("").map(String::from);
 120
 121     // #6819
 122     async fn f2(x: u32) -> u32 {
 123         x
 124     }
 125
 126     async fn f3() {
 127         match Some(0) {
 128             Some(x) => Some(f2(x).await),
 129             None => None,
 130         };
 131     }
 132
 133     // #6847
 134     if let Some(_) = Some(0) {
 135         Some(0)
 136     } else { Some(0).map(|x| x + 1) };
 137
 138     if true {
 139         Some(0)
 140     } else { Some(0).map(|x| x + 1) };
 141
 142     // #6967
 143     const fn f4() {
 144         match Some(0) {
 145             Some(x) => Some(x + 1),
 146             None => None,
 147         };
 148     }
 149
 150     // #7077
 151     let s = &String::new();
 152     #[allow(clippy::needless_match)]
 153     let _: Option<&str> = match Some(s) {
 154         Some(s) => Some(s),
 155         None => None,
 156     };
 157 }