Add test coverage of more varieties of panic temporaries

1 files changed, 28 insertions, 4 deletions

diff --git a/tests/ui/macros/panic-temporaries.rs b/tests/ui/macros/panic-temporaries.rs
index 5b5b8b7c2d9..db65601fb73 100644
--- a/tests/ui/macros/panic-temporaries.rs
+++ b/tests/ui/macros/panic-temporaries.rs
@@ -3,17 +3,41 @@
 
 #![allow(unreachable_code)]
 
+use std::fmt::{self, Display};
+use std::marker::PhantomData;
+
+struct NotSend {
+    marker: PhantomData<*const u8>,
+}
+
+const NOT_SEND: NotSend = NotSend { marker: PhantomData };
+
+impl Display for NotSend {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str("this value does not implement Send")
+    }
+}
+
 async fn f(_: u8) {}
 
-async fn g() {
-    // Todo returns `!`, so the await is never reached, and in particular the
+// Exercises this matcher in panic_2021:
+// ($($t:tt)+) => $crate::panicking::panic_fmt(...)
+async fn panic_fmt() {
+    // Panic returns `!`, so the await is never reached, and in particular the
     // temporaries inside the formatting machinery are not still alive at the
     // await point.
-    f(todo!("...")).await;
+    let todo = "...";
+    f(panic!("not yet implemented: {}", todo)).await;
+}
+
+// Exercises ("{}", $arg:expr) => $crate::panicking::panic_display(&$arg)
+async fn panic_display() {
+    f(panic!("{}", NOT_SEND)).await;
 }
 
 fn require_send(_: impl Send) {}
 
 fn main() {
-    require_send(g());
+    require_send(panic_fmt());
+    require_send(panic_display());
 }