blob: d7f8d7ac546c052884c439298b52ff48e66e413b (
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
|
// edition:2018
// compile-flags: --crate-type lib -Zdrop-tracking
use std::{cell::RefCell, fmt::Debug, rc::Rc};
fn non_sync() -> impl Debug {
RefCell::new(())
}
fn non_send() -> impl Debug {
Rc::new(())
}
fn take_ref<T>(_: &T) {}
async fn fut() {}
async fn fut_arg<T>(_: T) {}
async fn local_dropped_before_await() {
// this is okay now because of the drop
let x = non_send();
drop(x);
fut().await;
}
async fn non_send_temporary_in_match() {
// We could theoretically make this work as well (produce a `Send` future)
// for scrutinees / temporaries that can or will
// be dropped prior to the match body
// (e.g. `Copy` types).
match Some(non_send()) {
Some(_) => fut().await,
None => {}
}
}
fn get_formatter() -> std::fmt::Formatter<'static> {
panic!()
}
async fn non_sync_with_method_call() {
let f: &mut std::fmt::Formatter = &mut get_formatter();
// It would by nice for this to work.
if non_sync().fmt(f).unwrap() == () {
fut().await;
}
}
async fn non_sync_with_method_call_panic() {
let f: &mut std::fmt::Formatter = panic!();
if non_sync().fmt(f).unwrap() == () {
fut().await;
}
}
async fn non_sync_with_method_call_infinite_loop() {
let f: &mut std::fmt::Formatter = loop {};
if non_sync().fmt(f).unwrap() == () {
fut().await;
}
}
fn assert_send(_: impl Send) {}
pub fn pass_assert() {
assert_send(local_dropped_before_await());
assert_send(non_send_temporary_in_match());
//~^ ERROR future cannot be sent between threads safely
assert_send(non_sync_with_method_call());
//~^ ERROR future cannot be sent between threads safely
assert_send(non_sync_with_method_call_panic());
assert_send(non_sync_with_method_call_infinite_loop());
}
|
