Auto merge of #2236 - RalfJung:rustup, r=RalfJung

rustup

I feel like tests became a *lot* slower. I am not sure what is going on and don't have time to debug right now.

rust-version

@@ -1 +1 @@
-546c826f0ccaab36e897860205281f490db274e6
+1f34da9ec8a85b6f86c5fa1c121ab6f88f2f4966

tests/fail/data_race/fence_after_load.rs

@@ -1,4 +1,5 @@
-// compile-flags: -Zmiri-disable-isolation
+// We want to control preemption here.
+// compile-flags: -Zmiri-disable-isolation -Zmiri-preemption-rate=0
 // ignore-windows: Concurrency on Windows is not supported yet.
 use std::sync::Arc;
 use std::sync::atomic::{AtomicUsize, Ordering, fence};

tests/fail/erroneous_const.stderr

@@ -6,11 +6,11 @@ LL |     const VOID: ! = panic!();
    |
    = note: this error originates in the macro `$crate::panic::panic_2015` (in Nightly builds, run with -Z macro-backtrace for more info)
 
-error: post-monomorphization error: encountered constants with type errors, stopping evaluation
+error: post-monomorphization error: referenced constant has errors
   --> $DIR/erroneous_const.rs:LL:CC
    |
 LL |         let _ = PrintName::<T>::VOID;
-   |                 ^^^^^^^^^^^^^^^^^^^^ encountered constants with type errors, stopping evaluation
+   |                 ^^^^^^^^^^^^^^^^^^^^ referenced constant has errors
    |
    = note: inside `no_codegen::<i32>` at $DIR/erroneous_const.rs:LL:CC
 note: inside `main` at $DIR/erroneous_const.rs:LL:CC

tests/pass/concurrency/channels.rs

@@ -9,20 +9,23 @@ use std::thread;
 /// The test taken from the Rust documentation.
 fn simple_send() {
     let (tx, rx) = channel();
-    thread::spawn(move || {
+    let t = thread::spawn(move || {
         tx.send(10).unwrap();
     });
     assert_eq!(rx.recv().unwrap(), 10);
+    t.join().unwrap();
 }
 
 /// The test taken from the Rust documentation.
 fn multiple_send() {
     let (tx, rx) = channel();
+    let mut threads = vec![];
     for i in 0..10 {
         let tx = tx.clone();
-        thread::spawn(move || {
+        let t = thread::spawn(move || {
             tx.send(i).unwrap();
         });
+        threads.push(t);
     }
 
     let mut sum = 0;
@@ -32,6 +35,10 @@ fn multiple_send() {
         sum += j;
     }
     assert_eq!(sum, 45);
+
+    for t in threads {
+        t.join().unwrap();
+    }
 }
 
 /// The test taken from the Rust documentation.
@@ -41,13 +48,15 @@ fn send_on_sync() {
     // this returns immediately
     sender.send(1).unwrap();
 
-    thread::spawn(move || {
+    let t = thread::spawn(move || {
         // this will block until the previous message has been received
         sender.send(2).unwrap();
     });
 
     assert_eq!(receiver.recv().unwrap(), 1);
     assert_eq!(receiver.recv().unwrap(), 2);
+
+    t.join().unwrap();
 }
 
 fn main() {

tests/pass/threadleak_ignored.rs

@@ -1,5 +1,6 @@
 // ignore-windows: Concurrency on Windows is not supported yet.
-// compile-flags: -Zmiri-ignore-leaks
+// FIXME: disallow preemption to work around https://github.com/rust-lang/rust/issues/55005
+// compile-flags: -Zmiri-ignore-leaks -Zmiri-preemption-rate=0
 
 //! Test that leaking threads works, and that their destructors are not executed.