src/test/ui/typeck/typeck-default-trait-impl-negation-sync.rs


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

#![feature(negative_impls)]

struct Managed;
impl !Send for Managed {}
impl !Sync for Managed {}

use std::cell::UnsafeCell;

struct MySync {
   t: *mut u8
}

unsafe impl Sync for MySync {}

struct MyNotSync {
   t: *mut u8
}

impl !Sync for MyNotSync {}

struct MyTypeWUnsafe {
   t: UnsafeCell<u8>
}

struct MyTypeManaged {
   t: Managed
}

fn is_sync<T: Sync>() {}

fn main() {
    is_sync::<MySync>();
    is_sync::<MyNotSync>();
    //~^ ERROR `MyNotSync` cannot be shared between threads safely [E0277]

    is_sync::<MyTypeWUnsafe>();
    //~^ ERROR `UnsafeCell<u8>` cannot be shared between threads safely [E0277]

    is_sync::<MyTypeManaged>();
    //~^ ERROR `Managed` cannot be shared between threads safely [E0277]
}