1 files changed, 19 insertions, 0 deletions
diff --git a/tests/ui/traits/next-solver/trait-upcast-lhs-needs-normalization.rs b/tests/ui/traits/next-solver/trait-upcast-lhs-needs-normalization.rs
new file mode 100644
index 000000000..8e0378e94
--- /dev/null
+++ b/tests/ui/traits/next-solver/trait-upcast-lhs-needs-normalization.rs
@@ -0,0 +1,19 @@
+// check-pass
+// compile-flags: -Znext-solver
+#![feature(trait_upcasting)]
+
+pub trait A {}
+pub trait B: A {}
+
+pub trait Mirror {
+    type Assoc: ?Sized;
+}
+impl<T: ?Sized> Mirror for T {
+    type Assoc = T;
+}
+
+pub fn foo<'a>(x: &'a <dyn B + 'static as Mirror>::Assoc) -> &'a (dyn A + 'static) {
+    x
+}
+
+fn main() {}