1 files changed, 24 insertions, 0 deletions
diff --git a/src/test/ui/specialization/min_specialization/specialize_on_marker.rs b/src/test/ui/specialization/min_specialization/specialize_on_marker.rs
new file mode 100644
index 000000000..4219bd13b
--- /dev/null
+++ b/src/test/ui/specialization/min_specialization/specialize_on_marker.rs
@@ -0,0 +1,24 @@
+// Test that specializing on a `rustc_unsafe_specialization_marker` trait is
+// allowed.
+
+// check-pass
+
+#![feature(min_specialization)]
+#![feature(rustc_attrs)]
+
+#[rustc_unsafe_specialization_marker]
+trait SpecMarker {}
+
+trait X {
+    fn f();
+}
+
+impl<T> X for T {
+    default fn f() {}
+}
+
+impl<T: SpecMarker> X for T {
+    fn f() {}
+}
+
+fn main() {}