Fix decompilation of abstract events.

ICSharpCode.Decompiler/Ast/AstBuilder.cs

@@ -721,8 +721,19 @@ namespace ICSharpCode.Decompiler.Ast
 			return astProp;
 		}
 		
-		CustomEventDeclaration CreateEvent(EventDefinition eventDef)
+		AttributedNode CreateEvent(EventDefinition eventDef)
 		{
+			if (eventDef.AddMethod != null && eventDef.AddMethod.IsAbstract) {
+				// An abstract event cannot be custom
+				EventDeclaration astEvent = new EventDeclaration();
+				ConvertCustomAttributes(astEvent, eventDef);
+				astEvent.AddAnnotation(eventDef);
+				astEvent.Variables.Add(new VariableInitializer(CleanName(eventDef.Name)));
+				astEvent.ReturnType = ConvertType(eventDef.EventType, eventDef);
+				if (!eventDef.DeclaringType.IsInterface)
+					astEvent.Modifiers = ConvertModifiers(eventDef.AddMethod);
+				return astEvent;
+			} else {
 				CustomEventDeclaration astEvent = new CustomEventDeclaration();
 				ConvertCustomAttributes(astEvent, eventDef);
 				astEvent.AddAnnotation(eventDef);
@@ -746,6 +757,7 @@ namespace ICSharpCode.Decompiler.Ast
 				}
 				return astEvent;
 			}
+		}
 
 		FieldDeclaration CreateField(FieldDefinition fieldDef)
 		{