IronPython 2.7.7 is not compatible with DynamicLanguageRuntime 1.2.0.100.l

The following C# Console application project code, using IronPython 2.7.7, throws an exception when the project is referencing DynamicLanguageRuntime 1.2.0.100.l. It works just fine when the project is referencing DynamicLanguageRuntime 1.1.2.

using IronPython.Hosting;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;    

namespace TestApp
{
	class Program
	{
		static void Main(string[] args)
		{
			var options = new Dictionary<string, object>();
			options["Frames"] = true;
			options["FullFrames"] = true;
			var engine = Python.CreateEngine(options);
			string pyscript = @"";    

			var script = engine.CreateScriptSourceFromString(pyscript);
			var paths = engine.GetSearchPaths();
		}
	}
}

When using DynamicLanguageRuntime 1.2.0.100.l, the exception that’s thrown is:

An unhandled exception of type 'System.Reflection.TargetInvocationException' occurred in Microsoft.Scripting.dll

Whose inner exception reads:

Could not load type 'System.TypeExtensions' from assembly 'Microsoft.Scripting, Version=1.2.0.0, Culture=neutral

Inner Exception Source:

IronPython

Inner Exception Stack Trace:

at IronPython.Runtime.PythonContext.GetInitialPrefix()
at IronPython.Runtime.PythonContext..ctor(ScriptDomainManager manager, IDictionary`2 options)

The Nuget page claims IronPython 2.7.7 should be compatible with any version of DynamicLanguageRuntime >= 1.1.2, so there’s either a bug, or the dependency constraint should be updated. Again, the exception is not thrown when the project is using DynamicLanguageRuntime 1.1.2.

[slide]

The dependency in 2.7.7 is incorrect. There is not a way to update the nuget package for 2.7.7, nuget doesn’t allow this. This is a known issue. The recommendation would be to add a reference to DynamicLanguageRuntime 1.1.2 and then add a reference to IronPython 2.7.7.

[pankon]

Adding package from .nuget\packages\dynamiclanguageruntime\1.1.2\lib\Net40 worked for me