fix bug in ExpressionEvaluationVisitor: comparison of two enum values was not possible

src/AddIns/Debugger/Debugger.AddIn/NRefactory/ExpressionEvaluationVisitor.cs

@@ -114,8 +114,12 @@ namespace Debugger.AddIn
 		
 		public Value Convert(ResolveResult result)
 		{
-			if (result.IsCompileTimeConstant && !result.IsError)
-				return Eval.CreateValue(evalThread, result.ConstantValue);
+			if (result.IsCompileTimeConstant && !result.IsError) {
+				var type = Import(result.Type);
+				if (type == null)
+					throw new GetValueException("Error: cannot find '{0}'.", result.Type.FullName);
+				return Eval.CreateValue(evalThread, result.ConstantValue, type);
+			}
 			return Visit((dynamic)result);
 		}
 		

src/AddIns/Debugger/Debugger.Core/Eval.cs

@@ -268,7 +268,7 @@ namespace Debugger
 			);
 		}
 		
-		public static Value CreateValue(Thread evalThread, object value)
+		public static Value CreateValue(Thread evalThread, object value, IType type = null)
 		{
 			if (value == null) {
 				ICorDebugClass corClass = evalThread.AppDomain.ObjectType.ToCorDebug().GetClass();
@@ -278,9 +278,10 @@ namespace Debugger
 			} else if (value is string) {
 				return Eval.NewString(evalThread, (string)value);
 			} else {
-				if (!value.GetType().IsPrimitive)
+				if (type == null)
+					type = evalThread.AppDomain.Compilation.FindType(value.GetType());
+				if (!type.IsPrimitiveType() && type.Kind != TypeKind.Enum)
 					throw new DebuggerException("Value must be primitve type.  Seen " + value.GetType());
-				IType type = evalThread.AppDomain.Compilation.FindType(value.GetType());
 				Value val = Eval.NewObjectNoConstructor(evalThread, type);
 				val.SetPrimitiveValue(evalThread, value);
 				return val;

src/AddIns/Debugger/Debugger.Core/Value.cs

@@ -319,11 +319,17 @@ namespace Debugger
 			if (this.Type.IsKnownType(KnownTypeCode.String)) {
 				this.SetValue(evalThread, Eval.NewString(evalThread, value.ToString()));
 			} else {
-				if (!this.Type.IsPrimitiveType())
+				if (!Type.IsPrimitiveType() && Type.Kind != TypeKind.Enum)
 					throw new DebuggerException("Value is not a primitive type");
 				if (value == null)
 					throw new DebuggerException("Can not set primitive value to null");
-				CorGenericValue.SetValue(this.Type.GetDefinition().KnownTypeCode, value);
+				KnownTypeCode knownTypeCode;
+				var typeDefinition = this.Type.GetDefinition();
+				if (this.Type.Kind == TypeKind.Enum)
+					knownTypeCode = typeDefinition.EnumUnderlyingType.GetDefinition().KnownTypeCode;
+				else
+					knownTypeCode = typeDefinition.KnownTypeCode;
+				CorGenericValue.SetValue(knownTypeCode, value);
 			}
 		}