1 files changed, 18 insertions, 0 deletions
diff --git a/src/test/ui/generic-associated-types/issue-78671.rs b/src/test/ui/generic-associated-types/issue-78671.rs
new file mode 100644
index 000000000..c09dac28b
--- /dev/null
+++ b/src/test/ui/generic-associated-types/issue-78671.rs
@@ -0,0 +1,18 @@
+// revisions: base extended
+
+#![feature(generic_associated_types)]
+#![cfg_attr(extended, feature(generic_associated_types_extended))]
+#![cfg_attr(extended, allow(incomplete_features))]
+
+trait CollectionFamily {
+    type Member<T>;
+}
+fn floatify() {
+    Box::new(Family) as &dyn CollectionFamily<Member=usize>
+    //~^ ERROR: missing generics for associated type
+    //[base]~^^ ERROR: the trait `CollectionFamily` cannot be made into an object
+}
+
+struct Family;
+
+fn main() {}