Fixed references to enum values nested within generic types.

ICSharpCode.Decompiler/Ast/AstBuilder.cs

@@ -1501,13 +1501,13 @@ namespace ICSharpCode.Decompiler.Ast
 			{ // cannot rely on type.IsValueType, it's not set for typerefs (but is set for typespecs)
 				TypeDefinition enumDefinition = type.Resolve();
 				if (enumDefinition != null && enumDefinition.IsEnum) {
+					TypeCode enumBaseTypeCode = TypeCode.Int32;
 					foreach (FieldDefinition field in enumDefinition.Fields) {
 						if (field.IsStatic && object.Equals(CSharpPrimitiveCast.Cast(TypeCode.Int64, field.Constant, false), val))
-							return ConvertType(enumDefinition).Member(field.Name).WithAnnotation(field);
+							return ConvertType(type).Member(field.Name).WithAnnotation(field);
 						else if (!field.IsStatic && field.IsRuntimeSpecialName)
-							type = field.FieldType; // use primitive type of the enum
+							enumBaseTypeCode = TypeAnalysis.GetTypeCode(field.FieldType); // use primitive type of the enum
 					}
-					TypeCode enumBaseTypeCode = TypeAnalysis.GetTypeCode(type);
 					if (IsFlagsEnum(enumDefinition)) {
 						long enumValue = val;
 						Expression expr = null;
@@ -1534,7 +1534,7 @@ namespace ICSharpCode.Decompiler.Ast
 								continue;	// skip None enum value
 
 							if ((fieldValue & enumValue) == fieldValue) {
-								var fieldExpression = ConvertType(enumDefinition).Member(field.Name).WithAnnotation(field);
+								var fieldExpression = ConvertType(type).Member(field.Name).WithAnnotation(field);
 								if (expr == null)
 									expr = fieldExpression;
 								else
@@ -1543,7 +1543,7 @@ namespace ICSharpCode.Decompiler.Ast
 								enumValue &= ~fieldValue;
 							}
 							if ((fieldValue & negatedEnumValue) == fieldValue) {
-								var fieldExpression = ConvertType(enumDefinition).Member(field.Name).WithAnnotation(field);
+								var fieldExpression = ConvertType(type).Member(field.Name).WithAnnotation(field);
 								if (negatedExpr == null)
 									negatedExpr = fieldExpression;
 								else
@@ -1561,7 +1561,7 @@ namespace ICSharpCode.Decompiler.Ast
 							return new UnaryOperatorExpression(UnaryOperatorType.BitNot, negatedExpr);
 						}
 					}
-					return new Ast.PrimitiveExpression(CSharpPrimitiveCast.Cast(enumBaseTypeCode, val, false)).CastTo(ConvertType(enumDefinition));
+					return new Ast.PrimitiveExpression(CSharpPrimitiveCast.Cast(enumBaseTypeCode, val, false)).CastTo(ConvertType(type));
 				}
 			}
 			TypeCode code = TypeAnalysis.GetTypeCode(type);

ICSharpCode.Decompiler/Tests/Generics.cs

@@ -29,6 +29,12 @@ public static class Generics
 			public Y Item2;
 		}
 		
+		public enum NestedEnum
+		{
+			A,
+			B
+		}
+		
 		private T[] arr;
 		
 		public MyArray(int capacity)
@@ -75,11 +81,13 @@ public static class Generics
 		}
 	}
 	
+	private const Generics.MyArray<string>.NestedEnum enumVal = Generics.MyArray<string>.NestedEnum.A;
 	private static Type type1 = typeof(List<>);
 	private static Type type2 = typeof(Generics.MyArray<>);
 	private static Type type3 = typeof(List<>.Enumerator);
 	private static Type type4 = typeof(Generics.MyArray<>.NestedClass<>);
 	private static Type type5 = typeof(List<int>[]);
+	private static Type type6 = typeof(Generics.MyArray<>.NestedEnum);
 	
 	public static void MethodWithConstraint<T, S>() where T : class, S where S : ICloneable, new()
 	{

ICSharpCode.Decompiler/Tests/TestRunner.cs

@@ -158,7 +158,7 @@ namespace ICSharpCode.Decompiler.Tests
 		{
 			CSharpCodeProvider provider = new CSharpCodeProvider(new Dictionary<string, string> { { "CompilerVersion", "v4.0" } });
 			CompilerParameters options = new CompilerParameters();
-			options.CompilerOptions = "/unsafe";
+			options.CompilerOptions = "/unsafe /o-";
 			options.ReferencedAssemblies.Add("System.Core.dll");
 			CompilerResults results = provider.CompileAssemblyFromSource(options, code);
 			try {