1 files changed, 13 insertions, 0 deletions
diff --git a/src/test/ui/traits/issue-78372.rs b/src/test/ui/traits/issue-78372.rs
new file mode 100644
index 000000000..92f9f4b46
--- /dev/null
+++ b/src/test/ui/traits/issue-78372.rs
@@ -0,0 +1,13 @@
+use std::ops::DispatchFromDyn; //~ ERROR use of unstable library feature 'dispatch_from_dyn'
+struct Smaht<T, MISC>(PhantomData); //~ ERROR cannot find type `PhantomData` in this scope
+impl<T> DispatchFromDyn<Smaht<U, MISC>> for T {} //~ ERROR cannot find type `U` in this scope
+//~^ ERROR cannot find type `MISC` in this scope
+//~| ERROR use of unstable library feature 'dispatch_from_dyn'
+//~| ERROR the trait `DispatchFromDyn` may only be implemented for a coercion between structures
+trait Foo: X<u32> {}
+trait X<T> {
+    fn foo(self: Smaht<Self, T>);
+}
+trait Marker {}
+impl Marker for dyn Foo {}
+fn main() {}