Fix for making variable initializer synthetic.

pkg/analyzer/lib/src/summary/resynthesize.dart

 // Copyright (c) 2015, 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 summary_resynthesizer;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
@@ skipping 1448 matching lines @@
       // A missing entry in [LinkedUnit.types] means there is no [DartType]
       // stored in this slot.
       return null;
     }
     return buildType(type);
   }
 
   /**
    * Resynthesize a local [FunctionElement].
    */
-  FunctionElement buildLocalFunction(UnlinkedExecutable serializedExecutable) {
+  FunctionElementImpl buildLocalFunction(
+      UnlinkedExecutable serializedExecutable) {
     FunctionElementImpl element = new FunctionElementImpl(
         serializedExecutable.name, serializedExecutable.nameOffset);
     if (serializedExecutable.visibleOffset != 0) {
       element.setVisibleRange(serializedExecutable.visibleOffset,
           serializedExecutable.visibleLength);
     }
     buildExecutableCommonParts(element, serializedExecutable);
     return element;
   }
 
@@ skipping 76 matching lines @@
         // The type is inherited from the matching field.
         parameterElement.type = fields[serializedParameter.name]?.type ??
             summaryResynthesizer.typeProvider.dynamicType;
       } else {
         parameterElement.type =
             buildLinkedType(serializedParameter.inferredTypeSlot) ??
                 buildType(serializedParameter.type);
       }
       parameterElement.hasImplicitType = serializedParameter.type == null;
     }
-    if (serializedParameter.initializer != null) {
-      parameterElement.initializer =
-          buildLocalFunction(serializedParameter.initializer);
-    }
+    buildVariableInitializer(parameterElement, serializedParameter.initializer);
     switch (serializedParameter.kind) {
       case UnlinkedParamKind.named:
         parameterElement.parameterKind = ParameterKind.NAMED;
         break;
       case UnlinkedParamKind.positional:
         parameterElement.parameterKind = ParameterKind.POSITIONAL;
         break;
       case UnlinkedParamKind.required:
         parameterElement.parameterKind = ParameterKind.REQUIRED;
         break;
@@ skipping 163 matching lines @@
   /**
    * Handle the parts that are common to variables.
    */
   void buildVariableCommonParts(
       VariableElementImpl element, UnlinkedVariable serializedVariable) {
     element.type = buildLinkedType(serializedVariable.inferredTypeSlot) ??
         buildType(serializedVariable.type);
     element.const3 = serializedVariable.isConst;
     element.final2 = serializedVariable.isFinal;
     element.hasImplicitType = serializedVariable.type == null;
-    if (serializedVariable.initializer != null) {
-      element.initializer = buildLocalFunction(serializedVariable.initializer);
-    }
+    buildVariableInitializer(element, serializedVariable.initializer);
     buildDocumentation(element, serializedVariable.documentationComment);
     buildAnnotations(element, serializedVariable.annotations);
   }
 
   /**
+   * If the given [serializedInitializer] is not `null`, create the
+   * corresponding [FunctionElementImpl] and set it for the [variable].
+   */
+  void buildVariableInitializer(
+      VariableElementImpl variable, UnlinkedExecutable serializedInitializer) {
+    if (serializedInitializer == null) {
+      return null;
+    }
+    FunctionElementImpl initializerElement =
+        buildLocalFunction(serializedInitializer);
+    initializerElement.synthetic = true;
+    variable.initializer = initializerElement;
+  }
+
+  /**
    * Finish creating a [TypeParameterElement] by deserializing its bound.
    */
   void finishTypeParameter(UnlinkedTypeParam serializedTypeParameter,
       TypeParameterElementImpl typeParameterElement) {
     if (serializedTypeParameter.bound != null) {
       typeParameterElement.bound = buildType(serializedTypeParameter.bound);
     }
   }
 
   /**
@@ skipping 445 matching lines @@
                 }
               : () => this.element;
       // TODO(paulberry): Is it a bug that we have to pass `false` for
       // isInstantiated?
       return new DeferredFunctionTypeImpl(computer, null, typeArguments, false);
     } else {
       return null;
     }
   }
 }