1 files changed, 6 insertions, 0 deletions
diff --git a/tests/ui/impl-trait/rpit-not-sized.rs b/tests/ui/impl-trait/rpit-not-sized.rs
new file mode 100644
index 00000000000..bd25940780a
--- /dev/null
+++ b/tests/ui/impl-trait/rpit-not-sized.rs
@@ -0,0 +1,6 @@
+fn foo() -> impl ?Sized {
+    //~^ ERROR the size for values of type `impl ?Sized` cannot be known at compilation time
+    ()
+}
+
+fn main() {}