1 files changed, 52 insertions, 0 deletions
diff --git a/tests/src/JIT/Regression/JitBlue/GitHub_21231/GitHub_21231a.cs b/tests/src/JIT/Regression/JitBlue/GitHub_21231/GitHub_21231a.cs
new file mode 100644
index 0000000000..00466dabd2
--- /dev/null
+++ b/tests/src/JIT/Regression/JitBlue/GitHub_21231/GitHub_21231a.cs
@@ -0,0 +1,52 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+
+// Test case for issue 21231
+//
+// 
+// Debug: Outputs 2
+// Release: Outputs 1
+struct S0
+{
+    public sbyte F0;
+    public S0(sbyte p0): this()
+    {
+        F0 = p0;
+    }
+}
+
+struct S1
+{
+    public S0 F2;
+    public ushort F1;
+    public S1(S0 p2): this()
+    {
+        F2 = p2;
+    }
+}
+
+public class Program
+{
+    public static int Main()
+    {
+        var vr22 = new S1[]{new S1(new S0(1))};
+        S1 vr26;
+        vr26.F2 = vr22[0].F2;
+        vr22[0].F2.F0 += vr22[0].F2.F0;
+        vr26.F2 = vr22[0].F2;
+
+        if (vr26.F2.F0 != 2)
+        {
+            System.Console.WriteLine("Failed");
+	    return -1;
+        }
+        else
+        {
+            System.Console.WriteLine("Passed");
+	    return 100;
+        }
+    }
+}