Bug: Generic Function that returns a Delegate from \-Expression

Hello List,
I experienced a bug with mono 1.9.1 x64/Linux. Compilation fails (it works 
with MS csc 3.5.21022.8). Source and gmcs output is attached.

$ ./gmcs --version
Mono C# compiler version 1.9.1.0

$ gcc --version
gcc (GCC) 4.2.3 (Ubuntu 4.2.3-2ubuntu7)

Regards,
Simon Hengel

using System;
using System.Linq;
using System.Collections.Generic;

static class CurryBug
{	// curry for function of arity 3
	//
	// this compiles
	public static Func<int,Func<int, Func<int,int>>>
		curry_for_int_func (this Func<int,int,int,int> f)
	{
		return arg1 => arg2 => arg3 => f(arg1 , arg2 , arg3);
	}

	// but his does not
	static Func<A,Func<B,Func<C,D>>> curry<A,B,C,D> (this Func<A,B,C,D> f)
	{
		return arg1 => arg2 => arg3 => f(arg1, arg2, arg3);
	}

	static void Main ()
	{
		Func<int,int,int,int> plus = (x, y, z) => x + y + z;

		Console.WriteLine(plus.curry()(7)(23)(47));
	}
}

Internal compiler error at curry_bug.cs(16,42):: exception caught while emitting MethodBuilder [CurryBug::curry]

Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object
  at Mono.CSharp.ConstructedType..ctor (System.Type t, Mono.CSharp.TypeParameter[] type_params,
Location l) [0x00000] 
  at Mono.CSharp.TypeContainer.DoResolveType () [0x00000] 
  at Mono.CSharp.TypeContainer.ResolveType () [0x00000] 
  at Mono.CSharp.TypeContainer.ResolveType () [0x00000] 
  at Mono.CSharp.RootScopeInfo.LinkScopes () [0x00000] 
  at Mono.CSharp.ToplevelBlock.CompleteContexts (Mono.CSharp.EmitContext ec) [0x00000] 
  at Mono.CSharp.EmitContext.ResolveTopBlock (Mono.CSharp.EmitContext anonymous_method_host,
Mono.CSharp.ToplevelBlock block, Mono.CSharp.Parameters ip, IMethodData md, System.Boolean&
unreachable) [0x00000] 
  at Mono.CSharp.EmitContext.EmitTopBlock (IMethodData md, Mono.CSharp.ToplevelBlock block)
[0x00000] 
  at Mono.CSharp.MethodData.Emit (Mono.CSharp.DeclSpace parent) [0x00000] 
  at Mono.CSharp.Method.Emit () [0x00000] 

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