Expose LibraryElementImpl.libraryCycle through LibraryElement.

pkg/analyzer/lib/dart/element/element.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.
 
 /**
  * Defines the element model. The element model describes the semantic (as
  * opposed to syntactic) structure of Dart code. The syntactic structure of the
  * code is modeled by the [AST structure](../ast/ast.dart).
  *
  * The element model consists of two closely related kinds of objects: elements
@@ skipping 1307 matching lines @@
  *
  * Clients may not extend, implement or mix-in this class.
  */
 abstract class LibraryElement implements Element {
   /**
    * An empty list of library elements.
    */
   static const List<LibraryElement> EMPTY_LIST = const <LibraryElement>[];
 
   /**
+   * Return a list containing the strongly connected component in the
+   * import/export graph in which the current library resides.
+   */
+  List<LibraryElement> get libraryCycle;

[Brian Wilkerson, 2016/02/26 21:36:55]

This doesn't feel like a property to me, it feels like a computation, so I think
it would be better represented as a method.

+
+  /**
    * Return the compilation unit that defines this library.
    */
   CompilationUnitElement get definingCompilationUnit;
 
   /**
    * Return the entry point for this library, or `null` if this library does not
    * have an entry point. The entry point is defined to be a zero argument
    * top-level function whose name is `main`.
    */
   FunctionElement get entryPoint;
@@ skipping 619 matching lines @@
    */
   bool get isStatic;
 
   /**
    * Return the declared type of this variable, or `null` if the variable did
    * not have a declared type (such as if it was declared using the keyword
    * 'var').
    */
   DartType get type;
 }