anchor.diff:  }
   
   /**
  - * A [LibraryMirror] reflects a Dart language library, providing
  - * access to the variables, functions, classes, and interfaces of the
  - * library.
  - */
  -interface LibraryMirror extends ObjectMirror {
  -  /**
  -   * The name of this library, as provided in the [#library] declaration.
  -   */
  -  final String simpleName;
  -
  -  /**
  -   * The url of the library.
  -   *
  -   * TODO(turnidge): Document where this url comes from.  Will this
  -   * value be sensible?
  -   */
  -  final String url;
  -
  -  /**
  -   * An immutable map from from names to mirrors for all members in
  -   * this library.
  -   *
  -   * The members of a library are its top-level classes, interfaces,
  -   * functions, variables, getters, and setters.
  -   */
  -  final Map<String, Mirror> members;
  -
  -  /**
  -   * An immutable map from names to mirrors for all class and
  -   * interface declarations in this library.
  -   */
  -  final Map<String, ClassMirror> classes;
  -
  -  /**
  -   * An immutable map from names to mirrors for all function
  -   * declarations in this library.
  -   */
  -  final Map<String, MethodMirror> functions;
  -
  -  /**
  -   * An immutable map from names to mirrors for all variable
  -   * declarations in this library.
  -   */
  -  final Map<String, VariableMirror> variables;
  -}
  -
  -/**
    * A [MethodMirror] reflects a Dart language function, method,
    * constructor, getter, or setter.
    */
  
positive.code:   final bool isFinal;
  }
  
  
  /**
   * When an error occurs during the mirrored execution of code, a
  
negative.code: }
  
  /**
   * A [VariableMirror] reflects a Dart language variable declaration.
   */
  interface VariableMirror {
  