diff --git a/src/Boo.Core.sln b/src/Boo.Core.sln
index ffd80f031..aceeceb4a 100644
--- a/src/Boo.Core.sln
+++ b/src/Boo.Core.sln
@@ -17,11 +17,9 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Boo.Lang.Parser.Tests.Core"
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Tests", "Tests", "{3FD31683-A5EF-45B5-BD74-CEDFCF9A9EEA}"
 EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Lokad.ILPack", "..\..\ILPack\src\Lokad.ILPack.csproj", "{CFB4AE33-F886-4DD9-8855-F2B1AD6C5966}"
-EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Booc.Core", "booc\Booc.Core.csproj", "{2AAAA5D1-9D3C-414D-BAC7-7DC6FAFB790F}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Testcase", "Testcase\Testcase.csproj", "{C96E8F50-859F-4964-B7DD-727D052D8802}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Test", "Testcase\Test.csproj", "{C96E8F50-859F-4964-B7DD-727D052D8802}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -53,10 +51,6 @@ Global
 		{939974F4-9F00-4833-B897-962D2C28865F}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{939974F4-9F00-4833-B897-962D2C28865F}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{939974F4-9F00-4833-B897-962D2C28865F}.Release|Any CPU.Build.0 = Release|Any CPU
-		{CFB4AE33-F886-4DD9-8855-F2B1AD6C5966}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{CFB4AE33-F886-4DD9-8855-F2B1AD6C5966}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{CFB4AE33-F886-4DD9-8855-F2B1AD6C5966}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{CFB4AE33-F886-4DD9-8855-F2B1AD6C5966}.Release|Any CPU.Build.0 = Release|Any CPU
 		{2AAAA5D1-9D3C-414D-BAC7-7DC6FAFB790F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{2AAAA5D1-9D3C-414D-BAC7-7DC6FAFB790F}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{2AAAA5D1-9D3C-414D-BAC7-7DC6FAFB790F}.Release|Any CPU.ActiveCfg = Release|Any CPU
diff --git a/src/Boo.Lang.Compiler/Boo.Lang.Compiler Core.csproj b/src/Boo.Lang.Compiler/Boo.Lang.Compiler Core.csproj
index aca19ae9a..4f232c3e8 100644
--- a/src/Boo.Lang.Compiler/Boo.Lang.Compiler Core.csproj	
+++ b/src/Boo.Lang.Compiler/Boo.Lang.Compiler Core.csproj	
@@ -14,12 +14,10 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Lokad.ILPack" Version="0.1.7" />
     <PackageReference Include="System.Security.Permissions" Version="5.0.0" />
   </ItemGroup>
 
   <ItemGroup>
-    <ProjectReference Include="..\..\..\ILPack\src\Lokad.ILPack.csproj" />
     <ProjectReference Include="..\Boo.Lang\Boo.Lang Core.csproj" />
   </ItemGroup>
 
diff --git a/src/Boo.Lang.Compiler/Steps/Ecma335/TypeSystemBridge.cs b/src/Boo.Lang.Compiler/Steps/Ecma335/TypeSystemBridge.cs
index 3fad8eeef..1769fb2a3 100644
--- a/src/Boo.Lang.Compiler/Steps/Ecma335/TypeSystemBridge.cs
+++ b/src/Boo.Lang.Compiler/Steps/Ecma335/TypeSystemBridge.cs
@@ -45,13 +45,11 @@ public TypeSystemBridge(MetadataBuilder builder, TypeSystemServices tss, Func<IT
             ValueTypeEntity = tss.ValueTypeType;
             ObjectTypeEntity = tss.ObjectType;
 
-            /*
             var loadedAssemblies = AppDomain.CurrentDomain.GetAssemblies();
             var runtimeName = loadedAssemblies.Single(a => a.GetName().Name == "System.Runtime").GetName();
             var privateAsm = loadedAssemblies.Single(a => a.GetName().Name == "System.Private.CoreLib");
             var handle = HandleForAssemblyName(runtimeName);
             _assemblyLookup[privateAsm] = handle;
-            */
 
             ObjectType = (TypeReferenceHandle)LookupType(tss.ObjectType);
             _getValue = getValue;
diff --git a/src/Testcase/Program.cs b/src/Testcase/Program.cs
index 27212bd1d..d68c3c8af 100644
--- a/src/Testcase/Program.cs
+++ b/src/Testcase/Program.cs
@@ -1,24 +1,18 @@
-using System;
+using System.Threading;
+using System.Threading.Tasks;
+using System;
+using System.Linq;
 
-namespace Testcase
+class Program
 {
-    public class Foo { }
-
-    public class Bar : Foo
-    {
-        virtual public void Run()
-        {
-            Console.WriteLine("Bar.Run");
-        }
-    }
-
-    internal class Program
+    static void Main()
     {
-        static void Main(string[] args)
-        {
-            var foos = new Foo[] { new Bar(), new Bar() };
-            foreach (Bar foo in foos)
-                foo.Run();
-        }
-    }
-}
+		var asm = typeof(C0).Assembly;
+		foreach (var type in asm.GetTypes())
+		{
+			Console.WriteLine(type.Name);
+			foreach (var arg in (Attribute.GetCustomAttribute(asm.GetType(type.Name), typeof(VarArgsAttribute)) as VarArgsAttribute).Args)
+				Console.WriteLine($"\t{arg}");
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/Testcase/Test.csproj b/src/Testcase/Test.csproj
new file mode 100644
index 000000000..bacdb9a0d
--- /dev/null
+++ b/src/Testcase/Test.csproj
@@ -0,0 +1,21 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Boo.Lang\Boo.Lang Core.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Reference Include="testcase">
+      <HintPath>C:\Users\mason\AppData\Local\Temp\testcase.dll</HintPath>
+    </Reference>
+    <Reference Include="varargs-attribute-external%2417">
+      <HintPath>C:\Users\mason\AppData\Local\Temp\varargs-attribute-external$17.dll</HintPath>
+    </Reference>
+  </ItemGroup>
+
+</Project>
diff --git a/src/Testcase/Testcase.csproj b/src/Testcase/Testcase.csproj
deleted file mode 100644
index 208270428..000000000
--- a/src/Testcase/Testcase.csproj
+++ /dev/null
@@ -1,8 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
-  <PropertyGroup>
-    <OutputType>Exe</OutputType>
-    <TargetFramework>net5.0</TargetFramework>
-  </PropertyGroup>
-
-</Project>
diff --git a/tests/testcases/integration/attributes/varargs-attribute-external.boo b/tests/testcases/integration/attributes/varargs-attribute-external.boo
index 8db530fa3..127a7ff9f 100644
--- a/tests/testcases/integration/attributes/varargs-attribute-external.boo
+++ b/tests/testcases/integration/attributes/varargs-attribute-external.boo
@@ -18,7 +18,7 @@ code = [|
 	import System
 	
 	[VarArgs]
-	class C0:
+	public class C0:
 		pass
 		
 	[VarArgs("foo")]