blob: 370dbd5882161c837c4ffd14a531c99aa7145f0d (
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
|
#![allow(unused)]
#![warn(clippy::mut_from_ref)]
struct Foo;
impl Foo {
fn this_wont_hurt_a_bit(&self) -> &mut Foo {
unsafe { unimplemented!() }
}
}
trait Ouch {
fn ouch(x: &Foo) -> &mut Foo;
}
impl Ouch for Foo {
fn ouch(x: &Foo) -> &mut Foo {
unsafe { unimplemented!() }
}
}
fn fail(x: &u32) -> &mut u16 {
unsafe { unimplemented!() }
}
fn fail_lifetime<'a>(x: &'a u32, y: &mut u32) -> &'a mut u32 {
unsafe { unimplemented!() }
}
fn fail_double<'a, 'b>(x: &'a u32, y: &'a u32, z: &'b mut u32) -> &'a mut u32 {
unsafe { unimplemented!() }
}
// this is OK, because the result borrows y
fn works<'a>(x: &u32, y: &'a mut u32) -> &'a mut u32 {
unsafe { unimplemented!() }
}
// this is also OK, because the result could borrow y
fn also_works<'a>(x: &'a u32, y: &'a mut u32) -> &'a mut u32 {
unsafe { unimplemented!() }
}
unsafe fn also_broken(x: &u32) -> &mut u32 {
unimplemented!()
}
fn without_unsafe(x: &u32) -> &mut u32 {
unimplemented!()
}
fn main() {
//TODO
}
|
