Serialize constant initializers.

pkg/analyzer/lib/src/generated/constant.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.src.generated.constant;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
@@ skipping 472 matching lines @@
           // const factory constructors in the SDK, or if the code contains
           // errors (such as delegating to a non-const constructor, or delegating
           // to a constructor that can't be resolved).  In any of these cases,
           // we'll evaluate calls to this constructor without having to refer to
           // any other constants.  So we don't need to report any dependencies.
           return;
         }
         bool superInvocationFound = false;
         List<ConstructorInitializer> initializers =
             constant.constantInitializers;
+        if (initializers == null) {
+          print('???');

[Paul Berry, 2016/01/19 21:39:29]

Temporary debugging code I assume?  Should be removed.

+        }
         for (ConstructorInitializer initializer in initializers) {
           if (initializer is SuperConstructorInvocation) {
             superInvocationFound = true;
           }
           initializer.accept(referenceFinder);
         }
         if (!superInvocationFound) {
           // No explicit superconstructor invocation found, so we need to
           // manually insert a reference to the implicit superconstructor.
           InterfaceType superclass =
@@ skipping 4965 matching lines @@
       return BoolState.from(_element == rightElement);
     } else if (rightOperand is DynamicState) {
       return BoolState.UNKNOWN_VALUE;
     }
     return BoolState.FALSE_STATE;
   }
 
   @override
   String toString() => _element == null ? "-unknown-" : _element.name;
 }