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

   1 // run-rustfix
   2 #![warn(clippy::option_if_let_else)]
   3 #![allow(clippy::redundant_closure)]
   4 #![allow(clippy::ref_option_ref)]
   5
   6 fn bad1(string: Option<&str>) -> (bool, &str) {
   7     string.map_or((false, "hello"), |x| (true, x))
   8 }
   9
  10 fn else_if_option(string: Option<&str>) -> Option<(bool, &str)> {
  11     if string.is_none() {
  12         None
  13     } else if let Some(x) = string {
  14         Some((true, x))
  15     } else {
  16         Some((false, ""))
  17     }
  18 }
  19
  20 fn unop_bad(string: &Option<&str>, mut num: Option<i32>) {
  21     let _ = string.map_or(0, |s| s.len());
  22     let _ = num.as_ref().map_or(&0, |s| s);
  23     let _ = num.as_mut().map_or(&mut 0, |s| {
  24         *s += 1;
  25         s
  26     });
  27     let _ = num.as_ref().map_or(&0, |s| s);
  28     let _ = num.map_or(0, |mut s| {
  29         s += 1;
  30         s
  31     });
  32     let _ = num.as_mut().map_or(&mut 0, |s| {
  33         *s += 1;
  34         s
  35     });
  36 }
  37
  38 fn longer_body(arg: Option<u32>) -> u32 {
  39     arg.map_or(13, |x| {
  40         let y = x * x;
  41         y * y
  42     })
  43 }
  44
  45 fn impure_else(arg: Option<i32>) {
  46     let side_effect = || {
  47         println!("return 1");
  48         1
  49     };
  50     let _ = arg.map_or_else(|| side_effect(), |x| x);
  51 }
  52
  53 fn test_map_or_else(arg: Option<u32>) {
  54     let _ = arg.map_or_else(|| {
  55         let mut y = 1;
  56         y = (y + 2 / y) / 2;
  57         y = (y + 2 / y) / 2;
  58         y
  59     }, |x| x * x * x * x);
  60 }
  61
  62 fn negative_tests(arg: Option<u32>) -> u32 {
  63     let _ = if let Some(13) = arg { "unlucky" } else { "lucky" };
  64     for _ in 0..10 {
  65         let _ = if let Some(x) = arg {
  66             x
  67         } else {
  68             continue;
  69         };
  70     }
  71     let _ = if let Some(x) = arg {
  72         return x;
  73     } else {
  74         5
  75     };
  76     7
  77 }
  78
  79 fn main() {
  80     let optional = Some(5);
  81     let _ = optional.map_or(5, |x| x + 2);
  82     let _ = bad1(None);
  83     let _ = else_if_option(None);
  84     unop_bad(&None, None);
  85     let _ = longer_body(None);
  86     test_map_or_else(None);
  87     let _ = negative_tests(None);
  88     let _ = impure_else(None);
  89 }