1 files changed, 13 insertions, 0 deletions
diff --git a/tests/ui/feature-gates/feature-gate-trait_upcasting.rs b/tests/ui/feature-gates/feature-gate-trait_upcasting.rs
new file mode 100644
index 000000000..e4102f1cf
--- /dev/null
+++ b/tests/ui/feature-gates/feature-gate-trait_upcasting.rs
@@ -0,0 +1,13 @@
+trait Foo {}
+
+trait Bar: Foo {}
+
+impl Foo for () {}
+
+impl Bar for () {}
+
+fn main() {
+    let bar: &dyn Bar = &();
+    let foo: &dyn Foo = bar;
+    //~^ ERROR trait upcasting coercion is experimental [E0658]
+}