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
179
180
181
182
183
184
185
186
187
188
189
|
//@aux-build:proc_macros.rs
#![feature(lint_reasons)]
#![warn(clippy::default_numeric_fallback)]
#![allow(
unused,
clippy::never_loop,
clippy::no_effect,
clippy::unnecessary_operation,
clippy::branches_sharing_code,
clippy::let_unit_value,
clippy::let_with_type_underscore
)]
extern crate proc_macros;
use proc_macros::{external, inline_macros};
mod basic_expr {
fn test() {
// Should lint unsuffixed literals typed `i32`.
let x = 22;
let x = [1, 2, 3];
let x = if true { (1, 2) } else { (3, 4) };
let x = match 1 {
1 => 1,
_ => 2,
};
// Should NOT lint suffixed literals.
let x = 22_i32;
// Should NOT lint literals in init expr if `Local` has a type annotation.
let x: [i32; 3] = [1, 2, 3];
let x: (i32, i32) = if true { (1, 2) } else { (3, 4) };
let x: _ = 1;
let x: u64 = 1;
const CONST_X: i8 = 1;
}
}
mod nested_local {
fn test() {
let x: _ = {
// Should lint this because this literal is not bound to any types.
let y = 1;
// Should NOT lint this because this literal is bound to `_` of outer `Local`.
1
};
let x: _ = if true {
// Should lint this because this literal is not bound to any types.
let y = 1;
// Should NOT lint this because this literal is bound to `_` of outer `Local`.
1
} else {
// Should lint this because this literal is not bound to any types.
let y = 1;
// Should NOT lint this because this literal is bound to `_` of outer `Local`.
2
};
const CONST_X: i32 = {
// Should lint this because this literal is not bound to any types.
let y = 1;
// Should NOT lint this because this literal is bound to `_` of outer `Local`.
1
};
}
}
mod function_def {
fn ret_i32() -> i32 {
// Even though the output type is specified,
// this unsuffixed literal is linted to reduce heuristics and keep codebase simple.
1
}
fn test() {
// Should lint this because return type is inferred to `i32` and NOT bound to a concrete
// type.
let f = || -> _ { 1 };
// Even though the output type is specified,
// this unsuffixed literal is linted to reduce heuristics and keep codebase simple.
let f = || -> i32 { 1 };
}
}
mod function_calls {
fn concrete_arg(x: i32) {}
fn generic_arg<T>(t: T) {}
fn test() {
// Should NOT lint this because the argument type is bound to a concrete type.
concrete_arg(1);
// Should lint this because the argument type is inferred to `i32` and NOT bound to a concrete type.
generic_arg(1);
// Should lint this because the argument type is inferred to `i32` and NOT bound to a concrete type.
let x: _ = generic_arg(1);
}
}
mod struct_ctor {
struct ConcreteStruct {
x: i32,
}
struct GenericStruct<T> {
x: T,
}
fn test() {
// Should NOT lint this because the field type is bound to a concrete type.
ConcreteStruct { x: 1 };
// Should lint this because the field type is inferred to `i32` and NOT bound to a concrete type.
GenericStruct { x: 1 };
// Should lint this because the field type is inferred to `i32` and NOT bound to a concrete type.
let _ = GenericStruct { x: 1 };
}
}
mod enum_ctor {
enum ConcreteEnum {
X(i32),
}
enum GenericEnum<T> {
X(T),
}
fn test() {
// Should NOT lint this because the field type is bound to a concrete type.
ConcreteEnum::X(1);
// Should lint this because the field type is inferred to `i32` and NOT bound to a concrete type.
GenericEnum::X(1);
}
}
mod method_calls {
struct StructForMethodCallTest;
impl StructForMethodCallTest {
fn concrete_arg(&self, x: i32) {}
fn generic_arg<T>(&self, t: T) {}
}
fn test() {
let s = StructForMethodCallTest {};
// Should NOT lint this because the argument type is bound to a concrete type.
s.concrete_arg(1);
// Should lint this because the argument type is bound to a concrete type.
s.generic_arg(1);
}
}
mod in_macro {
use super::*;
// Should lint in internal macro.
#[inline_macros]
fn internal() {
inline!(let x = 22;);
}
// Should NOT lint in external macro.
fn external() {
external!(let x = 22;);
}
}
fn check_expect_suppression() {
#[expect(clippy::default_numeric_fallback)]
let x = 21;
}
fn main() {}
|