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-rw-r--r--tests/ui/traits/issue-38404.stderr16
1 files changed, 15 insertions, 1 deletions
diff --git a/tests/ui/traits/issue-38404.stderr b/tests/ui/traits/issue-38404.stderr
index d7721d7e6..f8625f53b 100644
--- a/tests/ui/traits/issue-38404.stderr
+++ b/tests/ui/traits/issue-38404.stderr
@@ -12,6 +12,20 @@ LL | trait A<T>: std::ops::Add<Self> + Sized {}
LL | trait B<T>: A<T> {}
| - this trait cannot be made into an object...
-error: aborting due to previous error
+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 2 previous errors
For more information about this error, try `rustc --explain E0038`.