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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
#![warn(clippy::useless_vec)]
#![allow(clippy::nonstandard_macro_braces, clippy::uninlined_format_args, unused)]
use std::rc::Rc;
struct StructWithVec {
_x: Vec<i32>,
}
fn on_slice(_: &[u8]) {}
fn on_mut_slice(_: &mut [u8]) {}
#[allow(clippy::ptr_arg)]
fn on_vec(_: &Vec<u8>) {}
fn on_mut_vec(_: &mut Vec<u8>) {}
struct Line {
length: usize,
}
impl Line {
fn length(&self) -> usize {
self.length
}
}
fn main() {
on_slice(&[]);
on_slice(&[]);
on_mut_slice(&mut []);
on_slice(&[1, 2]);
on_slice(&[1, 2]);
on_mut_slice(&mut [1, 2]);
on_slice(&[1, 2]);
on_slice(&[1, 2]);
on_mut_slice(&mut [1, 2]);
#[rustfmt::skip]
on_slice(&[1, 2]);
on_slice(&[1, 2]);
on_mut_slice(&mut [1, 2]);
on_slice(&[1; 2]);
on_slice(&[1; 2]);
on_mut_slice(&mut [1; 2]);
on_vec(&vec![]);
on_vec(&vec![1, 2]);
on_vec(&vec![1; 2]);
on_mut_vec(&mut vec![]);
on_mut_vec(&mut vec![1, 2]);
on_mut_vec(&mut vec![1; 2]);
// Now with non-constant expressions
let line = Line { length: 2 };
on_slice(&vec![2; line.length]);
on_slice(&vec![2; line.length()]);
on_mut_slice(&mut vec![2; line.length]);
on_mut_slice(&mut vec![2; line.length()]);
on_vec(&vec![1; 201]); // Ok, size of `vec` higher than `too_large_for_stack`
on_mut_vec(&mut vec![1; 201]); // Ok, size of `vec` higher than `too_large_for_stack`
// Ok
for a in vec![1; 201] {
println!("{:?}", a);
}
// https://github.com/rust-lang/rust-clippy/issues/2262#issuecomment-783979246
let _x: i32 = [1, 2, 3].iter().sum();
// Do lint
let mut x = [1, 2, 3];
x.fill(123);
dbg!(x[0]);
dbg!(x.len());
dbg!(x.iter().sum::<i32>());
let _x: &[i32] = &[1, 2, 3];
for _ in [1, 2, 3] {}
// Don't lint
let x = vec![1, 2, 3];
let _v: Vec<i32> = x;
let x = vec![1, 2, 3];
let _s = StructWithVec { _x: x };
// Explicit type annotation would make the change to [1, 2, 3]
// a compile error.
let _x: Vec<i32> = vec![1, 2, 3];
// Calling a Vec method through a mutable reference
let mut x = vec![1, 2, 3];
let re = &mut x;
re.push(4);
// Comparing arrays whose length is not equal is a compile error
let x = vec![1, 2, 3];
let y = vec![1, 2, 3, 4];
dbg!(x == y);
// Non-copy types
let _x = vec![String::new(); 10];
#[allow(clippy::rc_clone_in_vec_init)]
let _x = vec![Rc::new(1); 10];
// Too large
let _x = vec![1; 201];
}
fn issue11075() {
macro_rules! repro {
($e:expr) => {
stringify!($e)
};
}
#[allow(clippy::never_loop)]
for _string in [repro!(true), repro!(null)] {
unimplemented!();
}
macro_rules! in_macro {
($e:expr, $vec:expr, $vec2:expr) => {{
vec![1; 2].fill(3);
vec![1, 2].fill(3);
for _ in vec![1, 2] {}
for _ in vec![1; 2] {}
for _ in vec![$e, $e] {}
for _ in vec![$e; 2] {}
for _ in $vec {}
for _ in $vec2 {}
}};
}
in_macro!(1, [1, 2], [1; 2]);
macro_rules! from_macro {
() => {
vec![1, 2, 3]
};
}
macro_rules! from_macro_repeat {
() => {
vec![1; 3]
};
}
for _ in from_macro!() {}
for _ in from_macro_repeat!() {}
}
#[clippy::msrv = "1.53"]
fn above() {
for a in [1, 2, 3] {
let _: usize = a;
}
for a in [String::new(), String::new()] {
let _: String = a;
}
}
#[clippy::msrv = "1.52"]
fn below() {
for a in vec![1, 2, 3] {
let _: usize = a;
}
for a in vec![String::new(), String::new()] {
let _: String = a;
}
}
|
