1 files changed, 34 insertions, 0 deletions
diff --git a/tests/ui/self/dispatch-from-dyn-zst-transmute.rs b/tests/ui/self/dispatch-from-dyn-zst-transmute.rs
new file mode 100644
index 00000000000..57c255b4d7b
--- /dev/null
+++ b/tests/ui/self/dispatch-from-dyn-zst-transmute.rs
@@ -0,0 +1,34 @@
+#![feature(arbitrary_self_types)]
+#![feature(unsize)]
+#![feature(dispatch_from_dyn)]
+
+use std::marker::PhantomData;
+use std::marker::Unsize;
+use std::ops::DispatchFromDyn;
+use std::ops::Deref;
+
+struct IsSendToken<T: ?Sized>(PhantomData<fn(T) -> T>);
+
+struct Foo<'a, U: ?Sized> {
+    token: IsSendToken<U>,
+    ptr: &'a U,
+}
+
+impl<'a, T, U> DispatchFromDyn<Foo<'a, U>> for Foo<'a, T>
+//~^ ERROR implementing the `DispatchFromDyn` trait requires multiple coercions
+where
+    T: Unsize<U> + ?Sized,
+    U: ?Sized {}
+
+trait Bar {
+    fn f(self: Foo<'_, Self>);
+}
+
+impl<U: ?Sized> Deref for Foo<'_, U> {
+    type Target = U;
+    fn deref(&self) -> &U {
+        self.ptr
+    }
+}
+
+fn main() {}