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