Merging upstream version 1.71.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/tests/ui/traits/new-solver/alias-bound-unsound.rs b/tests/ui/traits/new-solver/alias-bound-unsound.rs
new file mode 100644
index 000000000..00294c708
--- /dev/null
+++ b/tests/ui/traits/new-solver/alias-bound-unsound.rs
@@ -0,0 +1,27 @@
+// compile-flags: -Ztrait-solver=next
+
+// 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;
+}
+
+fn main() {
+    let x = String::from("hello, world");
+    drop(<() as Foo>::copy_me(&x));
+    //~^ ERROR `<() as Foo>::Item: Copy` is not satisfied
+    //~| ERROR `<() as Foo>::Item` is not well-formed
+    println!("{x}");
+}