1 files changed, 19 insertions, 0 deletions
diff --git a/src/test/ui/typeck/issue-88609.rs b/src/test/ui/typeck/issue-88609.rs
new file mode 100644
index 000000000..dc459c885
--- /dev/null
+++ b/src/test/ui/typeck/issue-88609.rs
@@ -0,0 +1,19 @@
+// Regression test for #88609:
+// The return type for `main` is not normalized while checking if it implements
+// the trait `std::process::Termination`.
+
+// build-pass
+
+trait Same {
+    type Output;
+}
+
+impl<T> Same for T {
+    type Output = T;
+}
+
+type Unit = <() as Same>::Output;
+
+fn main() -> Result<Unit, std::io::Error> {
+    unimplemented!()
+}