anchor.diff:  
     "async": const LibraryInfo(
         "async/async.dart",
  +      maturity: Maturity.STABLE,
         dart2jsPatchPath: "_internal/lib/async_patch.dart"),
   
     "chrome": const LibraryInfo(
         "chrome/dart2js/chrome_dart2js.dart",
  +      maturity: Maturity.DEPRECATED,
         category: "Client"),
   
     "collection": const LibraryInfo(
         "collection/collection.dart",
  +      maturity: Maturity.STABLE,
         dart2jsPatchPath: "_internal/lib/collection_patch.dart"),
   
     "convert": const LibraryInfo(
         "convert/convert.dart",
  +      maturity: Maturity.STABLE,
         dart2jsPatchPath: "_internal/lib/convert_patch.dart"),
   
     "core": const LibraryInfo(
         "core/core.dart",
  +      maturity: Maturity.STABLE,
         dart2jsPatchPath: "_internal/lib/core_patch.dart"),
   
     "html": const LibraryInfo(
         "html/dartium/html_dartium.dart",
         category: "Client",
  +      maturity: Maturity.WEB_STABLE,
         dart2jsPath: "html/dart2js/html_dart2js.dart"),
   
     "html_common": const LibraryInfo(
         "html/html_common/html_common.dart",
         category: "Client",
  +      maturity: Maturity.WEB_STABLE,
         dart2jsPath: "html/html_common/html_common_dart2js.dart",
         documented: false,
         implementation: true),
  
positive.code:    * do so.
     */
    final bool implementation;
  
    const LibraryInfo(this.path, {
                      this.category: "Shared",
  
negative.code:   "indexed_db": const LibraryInfo(
        "indexed_db/dartium/indexed_db_dartium.dart",
        category: "Client",
        maturity: Maturity.WEB_STABLE,
        dart2jsPath: "indexed_db/dart2js/indexed_db_dart2js.dart"),
  
    "io": const LibraryInfo(
        "io/io.dart",
        category: "Server",
        maturity: Maturity.STABLE,
        dart2jsPatchPath: "_internal/lib/io_patch.dart"),
  
    "isolate": const LibraryInfo(
        "isolate/isolate.dart",
        maturity: Maturity.STABLE,
        dart2jsPatchPath: "_internal/lib/isolate_patch.dart"),
  
    "js": const LibraryInfo(
        "js/dartium/js_dartium.dart",
        category: "Client",
        maturity: Maturity.STABLE,
        dart2jsPath: "js/dart2js/js_dart2js.dart"),
  
    "json": const LibraryInfo(
        "json/json.dart",
        maturity: Maturity.DEPRECATED),
  
    "math": const LibraryInfo(
        "math/math.dart",
        maturity: Maturity.STABLE,
        dart2jsPatchPath: "_internal/lib/math_patch.dart"),
  
    "mirrors": const LibraryInfo(
        "mirrors/mirrors.dart",
        maturity: Maturity.UNSTABLE, 
        dart2jsPatchPath: "_internal/lib/mirrors_patch.dart"),
  
    "nativewrappers": const LibraryInfo(
  