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

   1 // run-rustfix
   2
   3 #![warn(clippy::all)]
   4 #![warn(clippy::redundant_pattern_matching)]
   5 #![allow(
   6     unused_must_use,
   7     clippy::needless_bool,
   8     clippy::match_like_matches_macro,
   9     clippy::if_same_then_else
  10 )]
  11
  12 fn main() {
  13     if None::<()>.is_none() {}
  14
  15     if Some(42).is_some() {}
  16
  17     if Some(42).is_some() {
  18         foo();
  19     } else {
  20         bar();
  21     }
  22
  23     while Some(42).is_some() {}
  24
  25     while Some(42).is_none() {}
  26
  27     while None::<()>.is_none() {}
  28
  29     let mut v = vec![1, 2, 3];
  30     while v.pop().is_some() {
  31         foo();
  32     }
  33
  34     if None::<i32>.is_none() {}
  35
  36     if Some(42).is_some() {}
  37
  38     Some(42).is_some();
  39
  40     None::<()>.is_none();
  41
  42     let _ = None::<()>.is_none();
  43
  44     let opt = Some(false);
  45     let _ = if opt.is_some() { true } else { false };
  46
  47     issue6067();
  48
  49     let _ = if gen_opt().is_some() {
  50         1
  51     } else if gen_opt().is_none() {
  52         2
  53     } else {
  54         3
  55     };
  56 }
  57
  58 fn gen_opt() -> Option<()> {
  59     None
  60 }
  61
  62 fn foo() {}
  63
  64 fn bar() {}
  65
  66 // Methods that are unstable const should not be suggested within a const context, see issue #5697.
  67 // However, in Rust 1.48.0 the methods `is_some` and `is_none` of `Option` were stabilized as const,
  68 // so the following should be linted.
  69 const fn issue6067() {
  70     if Some(42).is_some() {}
  71
  72     if None::<()>.is_none() {}
  73
  74     while Some(42).is_some() {}
  75
  76     while None::<()>.is_none() {}
  77
  78     Some(42).is_some();
  79
  80     None::<()>.is_none();
  81 }