From 11f9d4db73d8a80e2f29ace655b525a28ca99238 Mon Sep 17 00:00:00 2001
From: Alice Ryhl <aliceryhl@google.com>
Date: Thu, 15 Jan 2026 10:25:45 +0100
Subject: [PATCH] macros: add test for special return types (#7857)

---
 tests-build/tests/macros.rs          |  3 +++
 tests-build/tests/pass/impl_trait.rs | 17 +++++++++++++++++
 2 files changed, 20 insertions(+)
 create mode 100644 tests-build/tests/pass/impl_trait.rs

diff --git a/tests-build/tests/macros.rs b/tests-build/tests/macros.rs
index 7e7e6943f..ff77191d0 100644
--- a/tests-build/tests/macros.rs
+++ b/tests-build/tests/macros.rs
@@ -12,6 +12,9 @@ fn compile_fail_full() {
     #[cfg(feature = "full")]
     t.pass("tests/pass/macros_main_loop.rs");
 
+    #[cfg(feature = "full")]
+    t.pass("tests/pass/impl_trait.rs");
+
     #[cfg(feature = "full")]
     t.compile_fail("tests/fail/macros_invalid_input.rs");
 
diff --git a/tests-build/tests/pass/impl_trait.rs b/tests-build/tests/pass/impl_trait.rs
new file mode 100644
index 000000000..e0b7b9583
--- /dev/null
+++ b/tests-build/tests/pass/impl_trait.rs
@@ -0,0 +1,17 @@
+use tests_build::tokio;
+
+#[tokio::main]
+async fn never() -> ! {
+    loop {}
+}
+
+#[tokio::main]
+async fn impl_trait() -> impl Iterator<Item = impl core::fmt::Debug> {
+    [()].into_iter()
+}
+
+fn main() {
+    if impl_trait().count() == 10 {
+        never();
+    }
+}