1 files changed, 20 insertions, 0 deletions
diff --git a/tests/ui/impl-trait/in-trait/dyn-compatibility.rs b/tests/ui/impl-trait/in-trait/dyn-compatibility.rs
new file mode 100644
index 00000000000..5cca4ad839c
--- /dev/null
+++ b/tests/ui/impl-trait/in-trait/dyn-compatibility.rs
@@ -0,0 +1,20 @@
+use std::fmt::Debug;
+
+trait Foo {
+    fn baz(&self) -> impl Debug;
+}
+
+impl Foo for u32 {
+    fn baz(&self) -> impl Debug {
+        32
+    }
+}
+
+fn main() {
+    let i = Box::new(42_u32) as Box<dyn Foo>;
+    //~^ ERROR the trait `Foo` cannot be made into an object
+    //~| ERROR the trait `Foo` cannot be made into an object
+    let s = i.baz();
+    //~^ ERROR the trait `Foo` cannot be made into an object
+    //~| ERROR the trait `Foo` cannot be made into an object
+}