anchor.diff:  
     "_js_mirrors": const LibraryInfo(
         "_internal/compiler/js_lib/js_mirrors.dart",
  -      category: "Internal",
  -      documented: false,
  -      platforms: DART2JS_PLATFORM),
  -
  -  "_js_names": const LibraryInfo(
  -      "_internal/compiler/js_lib/js_names.dart",
         category: "Internal",
         documented: false,
         platforms: DART2JS_PLATFORM),
  
positive.code:       maturity: Maturity.UNSTABLE,
        dart2jsPatchPath: "_internal/compiler/js_lib/mirrors_patch.dart"),
  
    "profiler": const LibraryInfo(
        "profiler/profiler.dart",
        maturity: Maturity.UNSTABLE),
  
    "nativewrappers": const LibraryInfo(
        "html/dartium/nativewrappers.dart",
        category: "Client",
        implementation: true,
        documented: false,
        platforms: VM_PLATFORM),
  
    "typed_data": const LibraryInfo(
        "typed_data/typed_data.dart",
        maturity: Maturity.STABLE,
  
negative.code:       maturity: Maturity.STABLE,
        dart2jsPatchPath: "_internal/compiler/js_lib/async_patch.dart"),
  
    "collection": const LibraryInfo(
        "collection/collection.dart",
        maturity: Maturity.STABLE,
  