test panics in threads

Author: RalfJung

tests/run-pass/concurrency/simple.rs

@@ -49,6 +49,16 @@ fn create_move_out() {
     assert_eq!(result.len(), 6);
 }
 
+fn panic() {
+    let result = thread::spawn(|| {
+        panic!("Hello!")
+    })
+    .join()
+    .unwrap_err();
+    let msg = result.downcast_ref::<&'static str>().unwrap();
+    assert_eq!(*msg, "Hello!");
+}
+
 fn main() {
     create_and_detach();
     create_and_join();
@@ -58,4 +68,5 @@ fn main() {
     create_nested_and_join();
     create_move_in();
     create_move_out();
+    panic();
 }

tests/run-pass/concurrency/simple.stderr

@@ -1,2 +1,3 @@
 warning: thread support is experimental. For example, Miri does not detect data races yet.
 
+thread '<unnamed>' panicked at 'Hello!', $DIR/simple.rs:54:9