1 files changed, 10 insertions, 0 deletions
diff --git a/src/test/ui/wf/wf-object-safe.rs b/src/test/ui/wf/wf-object-safe.rs
new file mode 100644
index 000000000..42e691755
--- /dev/null
+++ b/src/test/ui/wf/wf-object-safe.rs
@@ -0,0 +1,10 @@
+// Check that object-safe traits are not WF when used as object types.
+// Issue #21953.
+
+trait A {
+    fn foo(&self, _x: &Self);
+}
+
+fn main() {
+    let _x: &dyn A; //~ ERROR E0038
+}