diff --git a/llvm/test/Regression/TableGen/DagDefSubst.ll b/llvm/test/Regression/TableGen/DagDefSubst.ll
new file mode 100644
index 000000000000..a9cd59b9afbc
--- /dev/null
+++ b/llvm/test/Regression/TableGen/DagDefSubst.ll
@@ -0,0 +1,15 @@
+// RUN: tblgen %s | grep 'dag d = (X Y)' &&
+// RUN: tblgen %s | grep 'dag e = (Y X)'
+def X;
+
+class yclass;
+def Y : yclass;
+
+class C<yclass N> {
+  dag d = (X N);
+  dag e = (N X);
+}
+
+def VAL : C<Y>;
+
+