1 files changed, 27 insertions, 0 deletions
diff --git a/tests/ui/traits/next-solver/object-unsafety.rs b/tests/ui/traits/next-solver/object-unsafety.rs
new file mode 100644
index 000000000..cfa53948b
--- /dev/null
+++ b/tests/ui/traits/next-solver/object-unsafety.rs
@@ -0,0 +1,27 @@
+// compile-flags: -Znext-solver
+
+trait Setup {
+    type From: Copy;
+}
+
+fn copy<U: Setup + ?Sized>(from: &U::From) -> U::From {
+    *from
+}
+
+pub fn copy_any<T>(t: &T) -> T {
+    copy::<dyn Setup<From=T>>(t)
+    //~^ ERROR the type `&<dyn Setup<From = T> as Setup>::From` is not well-formed
+    //~| ERROR the trait bound `dyn Setup<From = T>: Setup` is not satisfied
+    //~| ERROR mismatched types
+    //~| ERROR the type `<dyn Setup<From = T> as Setup>::From` is not well-formed
+    //~| ERROR the size for values of type `<dyn Setup<From = T> as Setup>::From` cannot be known at compilation time
+
+    // FIXME(-Znext-solver): These error messages are horrible and some of them
+    // are even simple fallout from previous error.
+}
+
+fn main() {
+    let x = String::from("Hello, world");
+    let y = copy_any(&x);
+    println!("{y}");
+}