summaryrefslogtreecommitdiffstats
path: root/src/tools/clippy/tests/ui/match_single_binding.rs
blob: eea64fcb292b88602e3af07fc2ed08a42f3c808d (plain)
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
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
// run-rustfix

#![warn(clippy::match_single_binding)]
#![allow(unused_variables, clippy::toplevel_ref_arg)]

struct Point {
    x: i32,
    y: i32,
}

fn coords() -> Point {
    Point { x: 1, y: 2 }
}

macro_rules! foo {
    ($param:expr) => {
        match $param {
            _ => println!("whatever"),
        }
    };
}

fn main() {
    let a = 1;
    let b = 2;
    let c = 3;
    // Lint
    match (a, b, c) {
        (x, y, z) => {
            println!("{} {} {}", x, y, z);
        },
    }
    // Lint
    match (a, b, c) {
        (x, y, z) => println!("{} {} {}", x, y, z),
    }
    // Ok
    foo!(a);
    // Ok
    match a {
        2 => println!("2"),
        _ => println!("Not 2"),
    }
    // Ok
    let d = Some(5);
    match d {
        Some(d) => println!("{}", d),
        _ => println!("None"),
    }
    // Lint
    match a {
        _ => println!("whatever"),
    }
    // Lint
    match a {
        _ => {
            let x = 29;
            println!("x has a value of {}", x);
        },
    }
    // Lint
    match a {
        _ => {
            let e = 5 * a;
            if e >= 5 {
                println!("e is superior to 5");
            }
        },
    }
    // Lint
    let p = Point { x: 0, y: 7 };
    match p {
        Point { x, y } => println!("Coords: ({}, {})", x, y),
    }
    // Lint
    match p {
        Point { x: x1, y: y1 } => println!("Coords: ({}, {})", x1, y1),
    }
    // Lint
    let x = 5;
    match x {
        ref r => println!("Got a reference to {}", r),
    }
    // Lint
    let mut x = 5;
    match x {
        ref mut mr => println!("Got a mutable reference to {}", mr),
    }
    // Lint
    let product = match coords() {
        Point { x, y } => x * y,
    };
    // Lint
    let v = vec![Some(1), Some(2), Some(3), Some(4)];
    #[allow(clippy::let_and_return)]
    let _ = v
        .iter()
        .map(|i| match i.unwrap() {
            unwrapped => unwrapped,
        })
        .collect::<Vec<u8>>();
    // Ok
    let x = 1;
    match x {
        #[cfg(disabled_feature)]
        0 => println!("Disabled branch"),
        _ => println!("Enabled branch"),
    }

    // Ok
    let x = 1;
    let y = 1;
    match match y {
        0 => 1,
        _ => 2,
    } {
        #[cfg(disabled_feature)]
        0 => println!("Array index start"),
        _ => println!("Not an array index start"),
    }

    // Lint
    let x = 1;
    match x {
        // =>
        _ => println!("Not an array index start"),
    }
}

#[allow(dead_code)]
fn issue_8723() {
    let (mut val, idx) = ("a b", 1);

    val = match val.split_at(idx) {
        (pre, suf) => {
            println!("{}", pre);
            suf
        },
    };

    let _ = val;
}