Validate that int values that we write to summaries are >= 0.

pkg/analyzer/lib/src/generated/testing/element_factory.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.testing.element_factory;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
@@ skipping 82 matching lines @@
   static ConstLocalVariableElementImpl constLocalVariableElement(String name) =>
       new ConstLocalVariableElementImpl(name, 0);
 
   static ConstructorElementImpl constructorElement(
       ClassElement definingClass, String name, bool isConst,
       [List<DartType> argumentTypes]) {
     DartType type = definingClass.type;
     ConstructorElementImpl constructor = name == null
         ? new ConstructorElementImpl("", -1)
         : new ConstructorElementImpl(name, 0);
+    constructor.synthetic = name == null;
     constructor.const2 = isConst;
     if (argumentTypes != null) {
       int count = argumentTypes.length;
       List<ParameterElement> parameters = new List<ParameterElement>(count);
       for (int i = 0; i < count; i++) {
         ParameterElementImpl parameter = new ParameterElementImpl("a$i", i);
         parameter.type = argumentTypes[i];
         parameter.parameterKind = ParameterKind.REQUIRED;
         parameters[i] = parameter;
       }
@@ skipping 285 matching lines @@
   }
 
   static PropertyAccessorElementImpl getterElement(
       String name, bool isStatic, DartType type) {
     FieldElementImpl field = new FieldElementImpl(name, -1);
     field.static = isStatic;
     field.synthetic = true;
     field.type = type;
     field.final2 = true;
     PropertyAccessorElementImpl getter =
-        new PropertyAccessorElementImpl.forVariable(field);
+        new PropertyAccessorElementImpl(name, 0);
     getter.synthetic = false;
     getter.getter = true;
     getter.variable = field;
     getter.returnType = type;
+    getter.static = isStatic;
     field.getter = getter;
     FunctionTypeImpl getterType = new FunctionTypeImpl(getter);
     getter.type = getterType;
     return getter;
   }
 
   static ImportElementImpl importFor(
       LibraryElement importedLibrary, PrefixElement prefix,
       [List<NamespaceCombinator> combinators =
           NamespaceCombinator.EMPTY_LIST]) {
@@ skipping 196 matching lines @@
   }
 
   static TypeParameterElementImpl typeParameterWithType(String name,
       [DartType bound]) {
     TypeParameterElementImpl typeParameter = typeParameterElement(name);
     typeParameter.type = new TypeParameterTypeImpl(typeParameter);
     typeParameter.bound = bound;
     return typeParameter;
   }
 }