Expose LibraryElementImpl.libraryCycle through LibraryElement.

pkg/analyzer/lib/dart/element/element.dart

Index: pkg/analyzer/lib/dart/element/element.dart
diff --git a/pkg/analyzer/lib/dart/element/element.dart b/pkg/analyzer/lib/dart/element/element.dart
index f19579a42b221df7f5dba1966a5819fdd53c3d13..e89eb22103a278764c333cd0687d61c94b22f14e 100644
--- a/pkg/analyzer/lib/dart/element/element.dart
+++ b/pkg/analyzer/lib/dart/element/element.dart
@@ -1325,6 +1325,12 @@ abstract class LibraryElement implements Element {
   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;