1 files changed, 35 insertions, 0 deletions
diff --git a/src/test/ui/specialization/issue-36804.rs b/src/test/ui/specialization/issue-36804.rs
new file mode 100644
index 000000000..89350602f
--- /dev/null
+++ b/src/test/ui/specialization/issue-36804.rs
@@ -0,0 +1,35 @@
+// check-pass
+#![feature(specialization)] //~ WARN the feature `specialization` is incomplete
+
+pub struct Cloned<I>(I);
+
+impl<'a, I, T: 'a> Iterator for Cloned<I>
+where
+    I: Iterator<Item = &'a T>,
+    T: Clone,
+{
+    type Item = T;
+
+    fn next(&mut self) -> Option<T> {
+        unimplemented!()
+    }
+
+    default fn count(self) -> usize where Self: Sized {
+        self.fold(0, |cnt, _| cnt + 1)
+    }
+}
+
+impl<'a, I, T: 'a> Iterator for Cloned<I>
+where
+    I: Iterator<Item = &'a T>,
+    T: Copy,
+{
+    fn count(self) -> usize {
+        unimplemented!()
+    }
+}
+
+fn main() {
+    let a = [1,2,3,4];
+    Cloned(a.iter()).count();
+}