1 files changed, 51 insertions, 0 deletions
diff --git a/src/test/ui/never_type/dispatch_from_dyn_zst.rs b/src/test/ui/never_type/dispatch_from_dyn_zst.rs
new file mode 100644
index 000000000..764f58ce9
--- /dev/null
+++ b/src/test/ui/never_type/dispatch_from_dyn_zst.rs
@@ -0,0 +1,51 @@
+// run-pass
+
+#![feature(unsize, dispatch_from_dyn, never_type)]
+
+#![allow(dead_code)]
+
+use std::{
+    ops::DispatchFromDyn,
+    marker::{Unsize, PhantomData},
+};
+
+struct Zst;
+struct NestedZst(PhantomData<()>, Zst);
+
+
+struct WithUnit<T: ?Sized>(Box<T>, ());
+impl<T: ?Sized, U: ?Sized> DispatchFromDyn<WithUnit<U>> for WithUnit<T>
+    where T: Unsize<U> {}
+
+struct WithPhantom<T: ?Sized>(Box<T>, PhantomData<()>);
+impl<T: ?Sized, U: ?Sized> DispatchFromDyn<WithPhantom<U>> for WithPhantom<T>
+    where T: Unsize<U> {}
+
+struct WithNever<T: ?Sized>(Box<T>, !);
+impl<T: ?Sized, U: ?Sized> DispatchFromDyn<WithNever<U>> for WithNever<T>
+    where T: Unsize<U> {}
+
+struct WithZst<T: ?Sized>(Box<T>, Zst);
+impl<T: ?Sized, U: ?Sized> DispatchFromDyn<WithZst<U>> for WithZst<T>
+    where T: Unsize<U> {}
+
+struct WithNestedZst<T: ?Sized>(Box<T>, NestedZst);
+impl<T: ?Sized, U: ?Sized> DispatchFromDyn<WithNestedZst<U>> for WithNestedZst<T>
+    where T: Unsize<U> {}
+
+
+struct Generic<T: ?Sized, A>(Box<T>, A);
+impl<T: ?Sized, U: ?Sized> DispatchFromDyn<Generic<U, ()>> for Generic<T, ()>
+    where T: Unsize<U> {}
+impl<T: ?Sized, U: ?Sized> DispatchFromDyn<Generic<U, PhantomData<()>>>
+    for Generic<T, PhantomData<()>>
+    where T: Unsize<U> {}
+impl<T: ?Sized, U: ?Sized> DispatchFromDyn<Generic<U, !>> for Generic<T, !>
+    where T: Unsize<U> {}
+impl<T: ?Sized, U: ?Sized> DispatchFromDyn<Generic<U, Zst>> for Generic<T, Zst>
+    where T: Unsize<U> {}
+impl<T: ?Sized, U: ?Sized> DispatchFromDyn<Generic<U, NestedZst>> for Generic<T, NestedZst>
+    where T: Unsize<U> {}
+
+
+fn main() {}