blob: f7d832193a3a1a82e02e8bafd15edb6d0727126e (
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
|
// run-rustfix
#![warn(clippy::box_default)]
#[derive(Default)]
struct ImplementsDefault;
struct OwnDefault;
impl OwnDefault {
fn default() -> Self {
Self
}
}
macro_rules! outer {
($e: expr) => {
$e
};
}
fn main() {
let _string: Box<String> = Box::new(Default::default());
let _byte = Box::new(u8::default());
let _vec = Box::new(Vec::<u8>::new());
let _impl = Box::new(ImplementsDefault::default());
let _impl2 = Box::new(<ImplementsDefault as Default>::default());
let _impl3: Box<ImplementsDefault> = Box::new(Default::default());
let _own = Box::new(OwnDefault::default()); // should not lint
let _in_macro = outer!(Box::new(String::new()));
let _string_default = outer!(Box::new(String::from("")));
let _vec2: Box<Vec<ImplementsDefault>> = Box::new(vec![]);
let _vec3: Box<Vec<bool>> = Box::new(Vec::from([]));
let _vec4: Box<_> = Box::new(Vec::from([false; 0]));
let _more = ret_ty_fn();
call_ty_fn(Box::new(u8::default()));
issue_10381();
}
fn ret_ty_fn() -> Box<bool> {
Box::new(bool::default())
}
#[allow(clippy::boxed_local)]
fn call_ty_fn(_b: Box<u8>) {
issue_9621_dyn_trait();
}
use std::io::{Read, Result};
impl Read for ImplementsDefault {
fn read(&mut self, _: &mut [u8]) -> Result<usize> {
Ok(0)
}
}
fn issue_9621_dyn_trait() {
let _: Box<dyn Read> = Box::new(ImplementsDefault::default());
issue_10089();
}
fn issue_10089() {
let _closure = || {
#[derive(Default)]
struct WeirdPathed;
let _ = Box::new(WeirdPathed::default());
};
}
fn issue_10381() {
#[derive(Default)]
pub struct Foo {}
pub trait Bar {}
impl Bar for Foo {}
fn maybe_get_bar(i: u32) -> Option<Box<dyn Bar>> {
if i % 2 == 0 {
Some(Box::new(Foo::default()))
} else {
None
}
}
assert!(maybe_get_bar(2).is_some());
}
|
