Store return types of variable initializers in summaries.

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 1157 matching lines @@
   /**
    * If [isRedirectedConstructor] is `true` and [isFactory] is `false`, the
    * name of the constructor that this constructor redirects to; otherwise
    * empty.
    */
   @Id(17)
   String get redirectedConstructorName;
 
   /**
    * Declared return type of the executable.  Absent if the executable is a
-   * constructor or the return type is implicit.
+   * constructor or the return type is implicit.  Absent for executables
+   * associated with variable initializers and closures, since these
+   * executables may have return types that are not accessible via direct
+   * imports.
    */
   @Id(3)
   EntityRef get returnType;
 
   /**
    * Type parameters of the executable, if any.  Empty if support for generic
    * method syntax is disabled.
    */
   @Id(16)
   List<UnlinkedTypeParam> get typeParameters;
@@ skipping 383 matching lines @@
 }
 
 /**
  * Unlinked summary information about a name referred to in one library that
  * might be defined in another.
  */
 abstract class UnlinkedReference extends base.SummaryClass {
   /**
    * 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".
+   * For the pseudo-type `bottom`, the string is "*bottom*".
    */
   @Id(0)
   String get name;
 
   /**
    * Prefix used to refer to the entity, or zero if no prefix is used.  This is
    * an index into [UnlinkedUnit.references].
    *
    * Prefix references must always point backward; that is, for all i, if
    * UnlinkedUnit.references[i].prefixReference != 0, then
@@ skipping 295 matching lines @@
    */
   @Id(11)
   int get visibleLength;
 
   /**
    * If a local variable, the beginning of the visible range; zero otherwise.
    */
   @Id(12)
   int get visibleOffset;
 }