1 files changed, 42 insertions, 0 deletions
diff --git a/src/test/ui/dynamically-sized-types/dst-coerce-rc.rs b/src/test/ui/dynamically-sized-types/dst-coerce-rc.rs
new file mode 100644
index 000000000..683fa6850
--- /dev/null
+++ b/src/test/ui/dynamically-sized-types/dst-coerce-rc.rs
@@ -0,0 +1,42 @@
+// run-pass
+#![allow(unused_variables)]
+#![allow(stable_features)]
+// Test a very simple custom DST coercion.
+
+#![feature(core, rc_weak)]
+
+use std::cell::RefCell;
+use std::rc::{Rc, Weak};
+
+trait Baz {
+    fn get(&self) -> i32;
+}
+
+impl Baz for i32 {
+    fn get(&self) -> i32 {
+        *self
+    }
+}
+
+fn main() {
+    let a: Rc<[i32; 3]> = Rc::new([1, 2, 3]);
+    let b: Rc<[i32]> = a;
+    assert_eq!(b[0], 1);
+    assert_eq!(b[1], 2);
+    assert_eq!(b[2], 3);
+
+    let a: Rc<i32> = Rc::new(42);
+    let b: Rc<dyn Baz> = a.clone();
+    assert_eq!(b.get(), 42);
+
+    let c: Weak<i32> = Rc::downgrade(&a);
+    let d: Weak<dyn Baz> = c.clone();
+
+    let _c = b.clone();
+
+    let a: Rc<RefCell<i32>> = Rc::new(RefCell::new(42));
+    let b: Rc<RefCell<dyn Baz>> = a.clone();
+    assert_eq!(b.borrow().get(), 42);
+    // FIXME
+    let c: Weak<RefCell<dyn Baz>> = Rc::downgrade(&a) as Weak<_>;
+}