1 files changed, 32 insertions, 0 deletions
diff --git a/tests/ui/traits/next-solver/alias-bound-unsound.rs b/tests/ui/traits/next-solver/alias-bound-unsound.rs
new file mode 100644
index 000000000..4e279a84a
--- /dev/null
+++ b/tests/ui/traits/next-solver/alias-bound-unsound.rs
@@ -0,0 +1,32 @@
+// compile-flags: -Znext-solver
+
+// Makes sure that alias bounds are not unsound!
+
+#![feature(trivial_bounds)]
+
+trait Foo {
+    type Item: Copy
+    where
+        <Self as Foo>::Item: Copy;
+
+    fn copy_me(x: &Self::Item) -> Self::Item {
+        *x
+    }
+}
+
+impl Foo for () {
+    type Item = String where String: Copy;
+    //~^ ERROR overflow evaluating the requirement `<() as Foo>::Item: Copy`
+}
+
+fn main() {
+    let x = String::from("hello, world");
+    drop(<() as Foo>::copy_me(&x));
+    //~^ ERROR overflow evaluating the requirement `<() as Foo>::Item: Sized`
+    //~| ERROR overflow evaluating the requirement `<() as Foo>::Item == _`
+    //~| ERROR overflow evaluating the requirement `<() as Foo>::Item well-formed`
+    //~| ERROR overflow evaluating the requirement `String <: <() as Foo>::Item`
+    //~| ERROR overflow evaluating the requirement `&<() as Foo>::Item well-formed`
+    //~| ERROR overflow evaluating the requirement `<() as Foo>::Item normalizes-to _`
+    println!("{x}");
+}