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diff --git a/tests/src/JIT/Regression/JitBlue/GitHub_12392/GitHub_12392.cs b/tests/src/JIT/Regression/JitBlue/GitHub_12392/GitHub_12392.cs
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+// 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;
+using System.Reflection;
+
+namespace Test
+{
+ // This is a regression test for a bug in fgMorphRecognizeBoxNullable.
+ // See the comment in Setting<T>.HasValue for details.
+ class Program
+ {
+
+ static int Main(string[] args)
+ {
+ Test t = new Test();
+ if (!t.TestMethod())
+ {
+ Console.WriteLine("SUCCESS");
+ return 100;
+ }
+ else
+ {
+ Console.WriteLine("FAILURE");
+ return 0;
+ }
+ }
+ }
+
+ class Test
+ {
+ Setting<bool?> supportInteractive = Setting.ForBool(null);
+
+ public bool TestMethod()
+ {
+ return this.supportInteractive.HasValue;
+ }
+ }
+
+ public class Setting<T>
+ {
+ Setting()
+ {
+ }
+
+ public Setting(T value)
+ {
+ this.value = value;
+ }
+
+ public bool HasValue
+ {
+ get
+ {
+ if (this.value != null)
+ {
+ Type t = this.value.GetType();
+ if (t.IsGenericType)
+ {
+ if (t.GetGenericTypeDefinition() == typeof(Nullable<>))
+ {
+ PropertyInfo hasValueProperty = t.GetProperty("HasValue");
+ bool result = (bool)hasValueProperty.GetValue(this.value, null);
+ return result;
+ }
+ }
+ }
+
+ // The bug reproduces when the C# compiler generates
+ // ldnull
+ // cgt.un
+ // ret
+ // for this statement.
+ // The code above this statement is necessary so that some assertions are
+ // propagated and the statement gets re-morphed.
+ // The bug in fgMorphRecognizeBoxNullable was that it couldn't deal
+ // with a morphed helper call correctly.
+ return null != this.value;
+ }
+ }
+
+ T value;
+ public T Value
+ {
+ get { return this.value; }
+ set { this.value = value; }
+ }
+ }
+
+ public class Setting
+ {
+ Setting()
+ {
+ ;
+ }
+
+ public static Setting<bool?> ForBool(string parameter)
+ {
+ if (null == parameter)
+ {
+ return new Setting<bool?>(null);
+ }
+ Setting<bool?> setting = new Setting<bool?>(bool.Parse(parameter));
+ return setting;
+ }
+ }
+}