1 files changed, 42 insertions, 0 deletions
diff --git a/src/test/ui/traits/trait-upcasting/type-checking-test-2.stderr b/src/test/ui/traits/trait-upcasting/type-checking-test-2.stderr
new file mode 100644
index 000000000..93c71f54e
--- /dev/null
+++ b/src/test/ui/traits/trait-upcasting/type-checking-test-2.stderr
@@ -0,0 +1,42 @@
+error[E0605]: non-primitive cast: `&dyn Foo<i32>` as `&dyn Bar<u32>`
+  --> $DIR/type-checking-test-2.rs:20:13
+   |
+LL |     let _ = x as &dyn Bar<u32>; // Error
+   |             ^^^^^^^^^^^^^^^^^^ invalid cast
+   |
+help: consider borrowing the value
+   |
+LL |     let _ = &x as &dyn Bar<u32>; // Error
+   |             +
+
+error[E0277]: the trait bound `&dyn Foo<i32>: Bar<u32>` is not satisfied
+  --> $DIR/type-checking-test-2.rs:20:13
+   |
+LL |     let _ = x as &dyn Bar<u32>; // Error
+   |             ^ the trait `Bar<u32>` is not implemented for `&dyn Foo<i32>`
+   |
+   = note: required for the cast from `&dyn Foo<i32>` to the object type `dyn Bar<u32>`
+
+error[E0605]: non-primitive cast: `&dyn Foo<u32>` as `&dyn Bar<_>`
+  --> $DIR/type-checking-test-2.rs:26:13
+   |
+LL |     let a = x as &dyn Bar<_>; // Ambiguous
+   |             ^^^^^^^^^^^^^^^^ invalid cast
+   |
+help: consider borrowing the value
+   |
+LL |     let a = &x as &dyn Bar<_>; // Ambiguous
+   |             +
+
+error[E0277]: the trait bound `&dyn Foo<u32>: Bar<_>` is not satisfied
+  --> $DIR/type-checking-test-2.rs:26:13
+   |
+LL |     let a = x as &dyn Bar<_>; // Ambiguous
+   |             ^ the trait `Bar<_>` is not implemented for `&dyn Foo<u32>`
+   |
+   = note: required for the cast from `&dyn Foo<u32>` to the object type `dyn Bar<_>`
+
+error: aborting due to 4 previous errors
+
+Some errors have detailed explanations: E0277, E0605.
+For more information about an error, try `rustc --explain E0277`.