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diff --git a/src/test/ui/issues/issue-18959.stderr b/src/test/ui/issues/issue-18959.stderr
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+++ b/src/test/ui/issues/issue-18959.stderr
@@ -0,0 +1,18 @@
+error[E0038]: the trait `Bar` cannot be made into an object
+  --> $DIR/issue-18959.rs:11:12
+   |
+LL | fn foo(b: &dyn Bar) {
+   |            ^^^^^^^ `Bar` 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-18959.rs:1:20
+   |
+LL | pub trait Foo { fn foo<T>(&self, ext_thing: &T); }
+   |                    ^^^ ...because method `foo` has generic type parameters
+LL | pub trait Bar: Foo { }
+   |           --- this trait cannot be made into an object...
+   = help: consider moving `foo` to another trait
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0038`.