1 files changed, 27 insertions, 0 deletions
diff --git a/src/test/ui/traits/trait-upcasting/type-checking-test-1.rs b/src/test/ui/traits/trait-upcasting/type-checking-test-1.rs
new file mode 100644
index 000000000..79ddedd41
--- /dev/null
+++ b/src/test/ui/traits/trait-upcasting/type-checking-test-1.rs
@@ -0,0 +1,27 @@
+#![feature(trait_upcasting)]
+#![allow(incomplete_features)]
+
+trait Foo: Bar<i32> + Bar<u32> {}
+trait Bar<T> {
+    fn bar(&self) -> Option<T> {
+        None
+    }
+}
+
+fn test_specific(x: &dyn Foo) {
+    let _ = x as &dyn Bar<i32>; // OK
+    let _ = x as &dyn Bar<u32>; // OK
+}
+
+fn test_unknown_version(x: &dyn Foo) {
+    let _ = x as &dyn Bar<_>; // Ambiguous
+                              //~^ ERROR non-primitive cast
+                              //~^^ ERROR the trait bound `&dyn Foo: Bar<_>` is not satisfied
+}
+
+fn test_infer_version(x: &dyn Foo) {
+    let a = x as &dyn Bar<_>; // OK
+    let _: Option<u32> = a.bar();
+}
+
+fn main() {}