4 #![warn(clippy::redundant_pattern_matching)]
8 clippy::match_like_matches_macro,
9 clippy::unnecessary_wraps,
11 clippy::if_same_then_else
15 let result: Result<usize, usize> = Err(5);
18 if Ok::<i32, i32>(42).is_ok() {}
20 if Err::<i32, i32>(42).is_err() {}
22 while Ok::<i32, i32>(10).is_ok() {}
24 while Ok::<i32, i32>(10).is_err() {}
26 if Ok::<i32, i32>(42).is_ok() {}
28 if Err::<i32, i32>(42).is_err() {}
30 if let Ok(x) = Ok::<i32, i32>(42) {
34 Ok::<i32, i32>(42).is_ok();
36 Ok::<i32, i32>(42).is_err();
38 Err::<i32, i32>(42).is_err();
40 Err::<i32, i32>(42).is_ok();
42 let _ = if Ok::<usize, ()>(4).is_ok() { true } else { false };
48 let _ = if gen_res().is_ok() {
50 } else if gen_res().is_err() {
57 fn gen_res() -> Result<(), ()> {
68 fn result_opt() -> Result<Option<i32>, i32> {
72 fn try_result_opt() -> Result<i32, i32> {
73 while (r#try!(result_opt())).is_some() {}
74 if (r#try!(result_opt())).is_some() {}
81 while m!().is_some() {}
85 macro_rules! if_let_in_macro {
86 ($pat:pat, $x:expr) => {
87 if let Some($pat) = $x {}
91 // shouldn't be linted
92 if_let_in_macro!(_, Some(42));
95 // Methods that are unstable const should not be suggested within a const context, see issue #5697.
96 // However, in Rust 1.48.0 the methods `is_ok` and `is_err` of `Result` were stabilized as const,
97 // so the following should be linted.
98 const fn issue6067() {
99 if Ok::<i32, i32>(42).is_ok() {}
101 if Err::<i32, i32>(42).is_err() {}
103 while Ok::<i32, i32>(10).is_ok() {}
105 while Ok::<i32, i32>(10).is_err() {}
107 Ok::<i32, i32>(42).is_ok();
109 Err::<i32, i32>(42).is_err();