Don't serialize local variables.

pkg/analyzer/lib/src/summary/idl.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.
 
 /**
  * This file is an "idl" style description of the summary format.  It
  * contains abstract classes which declare the interface for reading data from
  * summaries.  It is parsed and transformed into code that implements the
  * summary format.
  *
@@ skipping 813 matching lines @@
   /**
    * The kind of the entity being referred to.  For the pseudo-types `dynamic`
    * and `void`, the kind is [ReferenceKind.classOrEnum].
    */
   @Id(2)
   ReferenceKind get kind;
 
   /**
    * If [kind] is [ReferenceKind.function] (that is, the entity being referred
    * to is a local function), the index of the function within
-   * [UnlinkedExecutable.localFunctions].  If [kind] is
-   * [ReferenceKind.variable], the index of the variable within
-   * [UnlinkedExecutable.localVariables].  Otherwise zero.
+   * [UnlinkedExecutable.localFunctions].  Otherwise zero.
    */
   @Id(6)
   int get localIndex;
 
   /**
    * If this [LinkedReference] doesn't have an associated [UnlinkedReference],
    * name of the entity being referred to.  For the pseudo-type `dynamic`, the
    * string is "dynamic".  For the pseudo-type `void`, the string is "void".
    */
   @Id(3)
@@ skipping 948 matching lines @@
    * The list of local labels.
    */
   @informative
   @Id(22)
   List<UnlinkedLabel> get localLabels;
 
   /**
    * The list of local variables.
    */
   @informative
+  @deprecated
   @Id(19)
   List<UnlinkedVariable> get localVariables;
 
   /**
    * Name of the executable.  For setters, this includes the trailing "=".  For
    * named constructors, this excludes the class name and excludes the ".".
    * For unnamed constructors, this is the empty string.
    */
   @Id(1)
   String get name;
@@ skipping 1568 matching lines @@
   @Id(11)
   int get visibleLength;
 
   /**
    * If a local variable, the beginning of the visible range; zero otherwise.
    */
   @informative
   @Id(12)
   int get visibleOffset;
 }