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
|
// run-rustfix
#![deny(rust_2021_incompatible_closure_captures)]
//~^ NOTE: the lint level is defined here
use std::thread;
#[derive(Debug)]
struct Foo(i32);
impl Drop for Foo {
fn drop(&mut self) {
println!("{:?} dropped", self.0);
}
}
/* Test Send Trait Migration */
struct SendPointer(*mut i32);
unsafe impl Send for SendPointer {}
fn test_send_trait() {
let mut f = 10;
let fptr = SendPointer(&mut f as *mut i32);
thread::spawn(move || unsafe {
//~^ ERROR: changes to closure capture
//~| NOTE: in Rust 2018, this closure implements `Send`
//~| NOTE: for more information, see
//~| HELP: add a dummy let to cause `fptr` to be fully captured
*fptr.0 = 20;
//~^ NOTE: in Rust 2018, this closure captures all of `fptr`, but in Rust 2021, it will only capture `fptr.0`
}).join().unwrap();
}
/* Test Sync Trait Migration */
struct CustomInt(*mut i32);
struct SyncPointer(CustomInt);
unsafe impl Sync for SyncPointer {}
unsafe impl Send for CustomInt {}
fn test_sync_trait() {
let mut f = 10;
let f = CustomInt(&mut f as *mut i32);
let fptr = SyncPointer(f);
thread::spawn(move || unsafe {
//~^ ERROR: changes to closure capture
//~| NOTE: in Rust 2018, this closure implements `Sync`
//~| NOTE: in Rust 2018, this closure implements `Send`
//~| NOTE: for more information, see
//~| HELP: add a dummy let to cause `fptr` to be fully captured
*fptr.0.0 = 20;
//~^ NOTE: in Rust 2018, this closure captures all of `fptr`, but in Rust 2021, it will only capture `fptr.0.0`
}).join().unwrap();
}
/* Test Clone Trait Migration */
struct S(Foo);
struct T(i32);
struct U(S, T);
impl Clone for U {
fn clone(&self) -> Self {
U(S(Foo(0)), T(0))
}
}
fn test_clone_trait() {
let f = U(S(Foo(0)), T(0));
let c = || {
//~^ ERROR: changes to closure capture in Rust 2021 will affect drop order and which traits the closure implements
//~| NOTE: in Rust 2018, this closure implements `Clone`
//~| NOTE: for more information, see
//~| HELP: add a dummy let to cause `f` to be fully captured
let f_1 = f.1;
//~^ NOTE: in Rust 2018, this closure captures all of `f`, but in Rust 2021, it will only capture `f.1`
println!("{:?}", f_1.0);
};
let c_clone = c.clone();
c_clone();
}
//~^ NOTE: in Rust 2018, `f` is dropped here, but in Rust 2021, only `f.1` will be dropped here as part of the closure
fn main() {
test_send_trait();
test_sync_trait();
test_clone_trait();
}
|
