1 files changed, 17 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-38404.stderr b/src/test/ui/issues/issue-38404.stderr
new file mode 100644
index 000000000..d7721d7e6
--- /dev/null
+++ b/src/test/ui/issues/issue-38404.stderr
@@ -0,0 +1,17 @@
+error[E0038]: the trait `B` cannot be made into an object
+  --> $DIR/issue-38404.rs:3:15
+   |
+LL | trait C<T>: A<dyn B<T, Output=usize>> {}
+   |               ^^^^^^^^^^^^^^^^^^^^^^ `B` cannot be made into an object
+   |
+note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
+  --> $DIR/issue-38404.rs:1:13
+   |
+LL | trait A<T>: std::ops::Add<Self> + Sized {}
+   |             ^^^^^^^^^^^^^^^^^^^ ...because it uses `Self` as a type parameter
+LL | trait B<T>: A<T> {}
+   |       - this trait cannot be made into an object...
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0038`.