1 files changed, 28 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-55380.rs b/src/test/ui/issues/issue-55380.rs
new file mode 100644
index 000000000..f7cb296d3
--- /dev/null
+++ b/src/test/ui/issues/issue-55380.rs
@@ -0,0 +1,28 @@
+// run-pass
+#![feature(specialization)]
+//~^ WARN the feature `specialization` is incomplete
+
+pub trait Foo {
+    fn abc() -> u32;
+    fn def() -> u32;
+}
+
+pub trait Marker {}
+
+impl Marker for () {}
+
+impl<T> Foo for T {
+    default fn abc() -> u32 { 16 }
+    default fn def() -> u32 { 42 }
+}
+
+impl<T: Marker> Foo for T {
+    fn def() -> u32 {
+        Self::abc()
+    }
+}
+
+fn main() {
+   assert_eq!(<()>::def(), 16);
+   assert_eq!(<i32>::def(), 42);
+}