Imported Upstream version 5.2.0.175

Former-commit-id: bb0468d0f257ff100aa895eb5fe583fb5dfbf900

mcs/tests/gtest-644.cs

@@ -0,0 +1,29 @@
+using System;
+
+public struct MoneyValue
+{
+	private readonly decimal _amount;
+
+	public MoneyValue (decimal amount)
+	{
+		_amount = amount;
+	}
+
+	public static implicit operator decimal (MoneyValue moneyValue)
+	{
+		return moneyValue._amount;
+	}
+}
+
+public class Program
+{
+	static void Main ()
+	{
+		var nullMoneyValue = (MoneyValue?) null;
+		var moneyValue = new MoneyValue (123);
+
+		var crashApplication = nullMoneyValue < moneyValue; 
+
+		Console.WriteLine("All OK");
+	}
+}