1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
// run-rustfix
#![warn(clippy::needless_match)]
#![allow(clippy::manual_map)]
#![allow(dead_code)]
#[derive(Clone, Copy)]
enum Choice {
A,
B,
C,
D,
}
#[allow(unused_mut)]
fn useless_match() {
let mut i = 10;
let _: i32 = i;
let _: i32 = i;
let mut _i_mut = i;
let s = "test";
let _: &str = s;
}
fn custom_type_match(se: Choice) {
let _: Choice = se;
// Don't trigger
let _: Choice = match se {
Choice::A => Choice::A,
Choice::B => Choice::B,
_ => Choice::C,
};
// Mingled, don't trigger
let _: Choice = match se {
Choice::A => Choice::B,
Choice::B => Choice::C,
Choice::C => Choice::D,
Choice::D => Choice::A,
};
}
fn option_match(x: Option<i32>) {
let _: Option<i32> = x;
// Don't trigger, this is the case for manual_map_option
let _: Option<i32> = match x {
Some(a) => Some(-a),
None => None,
};
}
fn func_ret_err<T>(err: T) -> Result<i32, T> {
Err(err)
}
fn result_match() {
let _: Result<i32, i32> = Ok(1);
let _: Result<i32, i32> = func_ret_err(0_i32);
}
fn if_let_option() -> Option<i32> {
Some(1)
}
fn if_let_result(x: Result<(), i32>) {
let _: Result<(), i32> = x;
let _: Result<(), i32> = x;
// Input type mismatch, don't trigger
let _: Result<(), i32> = if let Err(e) = Ok(1) { Err(e) } else { x };
}
fn if_let_custom_enum(x: Choice) {
let _: Choice = x;
// Don't trigger
let _: Choice = if let Choice::A = x {
Choice::A
} else if true {
Choice::B
} else {
x
};
}
fn main() {}
|
