diff --git a/src/test/run-pass/alloca-from-derived-tydesc.rs b/src/test/run-pass/alloca-from-derived-tydesc.rs
new file mode 100644
index 00000000000..9b37f368d02
--- /dev/null
+++ b/src/test/run-pass/alloca-from-derived-tydesc.rs
@@ -0,0 +1,17 @@
+// xfail-stage0
+
+tag option[T] {
+    some(T);
+    none;
+}
+
+type r[T] = rec(mutable (option[T])[] v);
+
+fn f[T]() -> T[] {
+    ret ~[];
+}
+
+fn main() {
+    let r[int] r = rec(mutable v=~[]);
+    r.v = f();
+}