1 files changed, 38 insertions, 0 deletions
diff --git a/src/test/ui/polymorphization/unsized_cast.stderr b/src/test/ui/polymorphization/unsized_cast.stderr
new file mode 100644
index 000000000..27f88d281
--- /dev/null
+++ b/src/test/ui/polymorphization/unsized_cast.stderr
@@ -0,0 +1,38 @@
+error: item has unused generic parameters
+  --> $DIR/unsized_cast.rs:11:18
+   |
+LL | fn foo<T: Default>() {
+   |        - generic parameter `T` is unused
+LL |     let _: T = Default::default();
+LL |     (|| Box::new(|| {}) as Box<dyn Fn()>)();
+   |                  ^^
+
+error: item has unused generic parameters
+  --> $DIR/unsized_cast.rs:11:6
+   |
+LL | fn foo<T: Default>() {
+   |        - generic parameter `T` is unused
+LL |     let _: T = Default::default();
+LL |     (|| Box::new(|| {}) as Box<dyn Fn()>)();
+   |      ^^
+
+error: item has unused generic parameters
+  --> $DIR/unsized_cast.rs:22:15
+   |
+LL | fn foo2<T: Default>() {
+   |         - generic parameter `T` is unused
+...
+LL |         call(&|| {}, ());
+   |               ^^
+
+error: item has unused generic parameters
+  --> $DIR/unsized_cast.rs:19:6
+   |
+LL | fn foo2<T: Default>() {
+   |         - generic parameter `T` is unused
+LL |     let _: T = Default::default();
+LL |     (|| {
+   |      ^^
+
+error: aborting due to 4 previous errors
+