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