1 files changed, 20 insertions, 0 deletions
diff --git a/tests/ui/traits/new-solver/alias_eq_substs_eq_not_intercrate.rs b/tests/ui/traits/new-solver/alias_eq_substs_eq_not_intercrate.rs
new file mode 100644
index 000000000..d4cc380fa
--- /dev/null
+++ b/tests/ui/traits/new-solver/alias_eq_substs_eq_not_intercrate.rs
@@ -0,0 +1,20 @@
+// compile-flags: -Ztrait-solver=next
+
+// check that a `alias-eq(<?0 as TraitB>::Assoc, <T as TraitB>::Assoc)` goal fails.
+
+// FIXME(deferred_projection_equality): add a test that this is true during coherence
+
+trait TraitB {
+    type Assoc;
+}
+
+fn needs_a<T: TraitB>() -> T::Assoc {
+    unimplemented!()
+}
+
+fn bar<T: TraitB>() {
+    let _: <_ as TraitB>::Assoc = needs_a::<T>();
+    //~^ error: type annotations needed
+}
+
+fn main() {}