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

   1 // run-rustfix
   2
   3 #![warn(clippy::match_single_binding)]
   4 #![allow(unused_variables, clippy::many_single_char_names, clippy::toplevel_ref_arg)]
   5
   6 struct Point {
   7     x: i32,
   8     y: i32,
   9 }
  10
  11 fn coords() -> Point {
  12     Point { x: 1, y: 2 }
  13 }
  14
  15 macro_rules! foo {
  16     ($param:expr) => {
  17         match $param {
  18             _ => println!("whatever"),
  19         }
  20     };
  21 }
  22
  23 fn main() {
  24     let a = 1;
  25     let b = 2;
  26     let c = 3;
  27     // Lint
  28     let (x, y, z) = (a, b, c);
  29     {
  30         println!("{} {} {}", x, y, z);
  31     }
  32     // Lint
  33     let (x, y, z) = (a, b, c);
  34     println!("{} {} {}", x, y, z);
  35     // Ok
  36     foo!(a);
  37     // Ok
  38     match a {
  39         2 => println!("2"),
  40         _ => println!("Not 2"),
  41     }
  42     // Ok
  43     let d = Some(5);
  44     match d {
  45         Some(d) => println!("{}", d),
  46         _ => println!("None"),
  47     }
  48     // Lint
  49     println!("whatever");
  50     // Lint
  51     {
  52         let x = 29;
  53         println!("x has a value of {}", x);
  54     }
  55     // Lint
  56     {
  57         let e = 5 * a;
  58         if e >= 5 {
  59             println!("e is superior to 5");
  60         }
  61     }
  62     // Lint
  63     let p = Point { x: 0, y: 7 };
  64     let Point { x, y } = p;
  65     println!("Coords: ({}, {})", x, y);
  66     // Lint
  67     let Point { x: x1, y: y1 } = p;
  68     println!("Coords: ({}, {})", x1, y1);
  69     // Lint
  70     let x = 5;
  71     let ref r = x;
  72     println!("Got a reference to {}", r);
  73     // Lint
  74     let mut x = 5;
  75     let ref mut mr = x;
  76     println!("Got a mutable reference to {}", mr);
  77     // Lint
  78     let Point { x, y } = coords();
  79     let product = x * y;
  80     // Lint
  81     let v = vec![Some(1), Some(2), Some(3), Some(4)];
  82     #[allow(clippy::let_and_return)]
  83     let _ = v
  84         .iter()
  85         .map(|i| {
  86             let unwrapped = i.unwrap();
  87             unwrapped
  88         })
  89         .collect::<Vec<u8>>();
  90     // Ok
  91     let x = 1;
  92     match x {
  93         #[cfg(disabled_feature)]
  94         0 => println!("Disabled branch"),
  95         _ => println!("Enabled branch"),
  96     }
  97     // Lint
  98     let x = 1;
  99     let y = 1;
 100     println!("Single branch");
 101     // Ok
 102     let x = 1;
 103     let y = 1;
 104     match match y {
 105         0 => 1,
 106         _ => 2,
 107     } {
 108         #[cfg(disabled_feature)]
 109         0 => println!("Array index start"),
 110         _ => println!("Not an array index start"),
 111     }
 112     // False negative
 113     let x = 1;
 114     match x {
 115         // =>
 116         _ => println!("Not an array index start"),
 117     }
 118 }