anchor.diff:   */
   class UnlinkedImport {
     /**
  -   * Relative URI used to reference the imported library.
  +   * URI used in the source code to reference the imported library.
      */
     String uri;
   
  
positive.code:  */
  class PrelinkedReference {
    /**
     * Index into [LibraryElement.dependencies] indicating which imported library
     * declares the entity being referred to.
     */
    int dependency;
  
    @Flag('CLASS', 0, 'Indicates that the thing being referred to is a class')
    @Flag('TYPEDEF', 1, 'Indicates that the thing being referred to is a typedef')
    @Flag('OTHER', 2,
        'Indicates that the thing being referred to is a variable or executable')
  
negative.code:  * implements the summary format.
   *
   * The code generation process introduces the following non-typical semantics:
   * - Fields of type List are never null, and have a default value of the empty
   *   list.
   * - Fields of type int are never null, and have a default value of zero.
   * - Fields of type String are never null, and have a default value of ''.
   *
   * Terminology used in this document:
   * - "Unlinked" refers to information that can be determined from reading the
  