blob: a39f0c9299bd5abdd8160fbf933034f5d6a30e78 (
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
|
#![allow(unused)]
#![warn(clippy::match_as_ref)]
fn match_as_ref() {
let owned: Option<()> = None;
let borrowed: Option<&()> = owned.as_ref();
let mut mut_owned: Option<()> = None;
let borrow_mut: Option<&mut ()> = mut_owned.as_mut();
}
mod issue4437 {
use std::error::Error;
use std::fmt;
use std::num::ParseIntError;
#[derive(Debug)]
struct E {
source: Option<ParseIntError>,
}
impl Error for E {
fn source(&self) -> Option<&(dyn Error + 'static)> {
self.source.as_ref().map(|x| x as _)
}
}
impl fmt::Display for E {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
unimplemented!()
}
}
}
fn main() {
// Don't lint
let _ = match Some(0) {
#[cfg(feature = "foo")]
Some(ref x) if *x > 50 => None,
Some(ref x) => Some(x),
None => None,
};
}
mod issue15691 {
use std::ops::{Deref, DerefMut};
struct A(B);
struct B;
impl Deref for A {
type Target = B;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl DerefMut for A {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.0
}
}
fn func() {
let mut a = Some(A(B));
let mut b = Some(B);
// Do not lint, we don't have `None => None`
let _ = match b {
Some(ref mut x) => Some(x),
None => a.as_deref_mut(),
};
}
}
|
