1 files changed, 13 insertions, 0 deletions
diff --git a/tests/ui/traits/new-solver/upcast-wrong-substs.rs b/tests/ui/traits/new-solver/upcast-wrong-substs.rs
new file mode 100644
index 000000000..f2d04d932
--- /dev/null
+++ b/tests/ui/traits/new-solver/upcast-wrong-substs.rs
@@ -0,0 +1,13 @@
+// compile-flags: -Ztrait-solver=next
+
+#![feature(trait_upcasting)]
+
+trait Foo: Bar<i32> + Bar<u32> {}
+
+trait Bar<T> {}
+
+fn main() {
+    let x: &dyn Foo = todo!();
+    let y: &dyn Bar<usize> = x;
+    //~^ ERROR mismatched types
+}