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
|
// run-rustfix
#![warn(clippy::match_ref_pats)]
#![allow(dead_code, unused_variables, clippy::equatable_if_let, clippy::enum_variant_names)]
fn ref_pats() {
{
let v = &Some(0);
match v {
&Some(v) => println!("{:?}", v),
&None => println!("none"),
}
match v {
// This doesn't trigger; we have a different pattern.
&Some(v) => println!("some"),
other => println!("other"),
}
}
let tup = &(1, 2);
match tup {
&(v, 1) => println!("{}", v),
_ => println!("none"),
}
// Special case: using `&` both in expr and pats.
let w = Some(0);
match &w {
&Some(v) => println!("{:?}", v),
&None => println!("none"),
}
// False positive: only wildcard pattern.
let w = Some(0);
#[allow(clippy::match_single_binding)]
match w {
_ => println!("none"),
}
let a = &Some(0);
if let &None = a {
println!("none");
}
let b = Some(0);
if let &None = &b {
println!("none");
}
}
mod ice_3719 {
macro_rules! foo_variant(
($idx:expr) => (Foo::get($idx).unwrap())
);
enum Foo {
A,
B,
}
impl Foo {
fn get(idx: u8) -> Option<&'static Self> {
match idx {
0 => Some(&Foo::A),
1 => Some(&Foo::B),
_ => None,
}
}
}
fn ice_3719() {
// ICE #3719
match foo_variant!(0) {
&Foo::A => println!("A"),
_ => println!("Wild"),
}
}
}
mod issue_7740 {
macro_rules! foobar_variant(
($idx:expr) => (FooBar::get($idx).unwrap())
);
enum FooBar {
Foo,
Bar,
FooBar,
BarFoo,
}
impl FooBar {
fn get(idx: u8) -> Option<&'static Self> {
match idx {
0 => Some(&FooBar::Foo),
1 => Some(&FooBar::Bar),
2 => Some(&FooBar::FooBar),
3 => Some(&FooBar::BarFoo),
_ => None,
}
}
}
fn issue_7740() {
// Issue #7740
match foobar_variant!(0) {
&FooBar::Foo => println!("Foo"),
&FooBar::Bar => println!("Bar"),
&FooBar::FooBar => println!("FooBar"),
_ => println!("Wild"),
}
// This shouldn't trigger
if let &FooBar::BarFoo = foobar_variant!(3) {
println!("BarFoo");
} else {
println!("Wild");
}
}
}
fn main() {}
|
