1 files changed, 17 insertions, 0 deletions
diff --git a/tests/ui/generics/generic-default-type-params-cross-crate.rs b/tests/ui/generics/generic-default-type-params-cross-crate.rs
new file mode 100644
index 000000000..834b15be1
--- /dev/null
+++ b/tests/ui/generics/generic-default-type-params-cross-crate.rs
@@ -0,0 +1,17 @@
+// run-pass
+// aux-build:default_type_params_xc.rs
+
+// pretty-expanded FIXME #23616
+
+extern crate default_type_params_xc;
+
+struct Vec<T, A = default_type_params_xc::Heap>(#[allow(unused_tuple_struct_fields)] Option<(T,A)>);
+
+struct Foo;
+
+fn main() {
+    let _a = Vec::<isize>(None);
+    let _b = Vec::<isize, default_type_params_xc::FakeHeap>(None);
+    let _c = default_type_params_xc::FakeVec::<isize> { f: None };
+    let _d = default_type_params_xc::FakeVec::<isize, Foo> { f: None };
+}