Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/tests/gtest-139.cs

@@ -0,0 +1,42 @@
+using System;
+
+public struct MyStruct
+{
+	public static int operator !=(MyStruct? a, string b)
+	{
+		return -1;
+	}
+	
+	public static int operator ==(MyStruct? a, string b)
+	{
+		return 1;
+	}
+	
+	public static int operator !=(string a, MyStruct? b)
+	{
+		return -2;
+	}
+	
+	public static int operator ==(string a, MyStruct? b)
+	{
+		return 2;
+	}
+}
+
+public class Test
+{
+	public static int Main()
+	{
+		MyStruct? ms = new MyStruct ();
+		int v;
+		v = ms == "a";
+		if (v != 1)
+			return 1;
+		
+		v = "b" != ms;
+		if (v != -2)
+			return 2;
+		
+		return 0;
+	}
+}