1 files changed, 17 insertions, 0 deletions
diff --git a/tests/ui/traits/next-solver/dont-coerce-infer-to-dyn.rs b/tests/ui/traits/next-solver/dont-coerce-infer-to-dyn.rs
new file mode 100644
index 000000000..da07869f3
--- /dev/null
+++ b/tests/ui/traits/next-solver/dont-coerce-infer-to-dyn.rs
@@ -0,0 +1,17 @@
+// compile-flags: -Znext-solver
+// check-pass
+
+use std::fmt::Display;
+use std::rc::Rc;
+
+fn mk<T: ?Sized>(t: Option<&T>) -> Rc<T> {
+    todo!()
+}
+
+fn main() {
+    let mut x = None;
+    let y = mk(x);
+    // Don't treat the line below as a unsize coercion `Rc<?0> ~> Rc<dyn Display>`
+    let z: Rc<dyn Display> = y;
+    x = Some(&1 as &dyn Display);
+}