ref structs cannot be boxed

ICSharpCode.Decompiler.Tests/TestCases/Correctness/Conversions.cs

@@ -112,7 +112,7 @@ namespace ICSharpCode.Decompiler.Tests.TestCases.Correctness
 
 			Console.WriteLine(ReadZeroTerminatedString("Hello World!".Length));
 			C1.Test();
-#if ROSLYN2 && !NET40
+#if CS120 && !NET40
 			C3.Run();
 #endif
 		}
@@ -204,7 +204,7 @@ namespace ICSharpCode.Decompiler.Tests.TestCases.Correctness
 		}
 	}
 
-#if ROSLYN2 && !NET40
+#if CS120 && !NET40
 	class C3
 	{
 		[InlineArray(4)] struct MyArray { private int elem; }

ICSharpCode.Decompiler/CSharp/Resolver/CSharpConversions.cs

@@ -779,7 +779,7 @@ namespace ICSharpCode.Decompiler.CSharp.Resolver
 		{
 			// C# 4.0 spec: §6.1.7
 			fromType = NullableType.GetUnderlyingType(fromType);
-			if (fromType.IsReferenceType == false && toType.IsReferenceType == true)
+			if (fromType.IsReferenceType == false && !fromType.IsByRefLike && toType.IsReferenceType == true)
 				return IsSubtypeOf(fromType, toType, 0);
 			else
 				return false;