anchor.diff:    _LIB_CONVERT,
     _LIB_FFI,
     _LIB_IO,
  +  _LIB_ISOLATE,
     _LIB_MATH,
     _LIB_HTML_DART2JS,
     _LIB_INTERCEPTORS,
  
positive.code:   'ffi': 'const LibraryInfo("ffi/ffi.dart")',
    'html': 'const LibraryInfo("html/dart2js/html_dart2js.dart")',
    'io': 'const LibraryInfo("io/io.dart")',
    'math': 'const LibraryInfo("math/math.dart")',
  };
  
  
negative.code:       '''
  library dart.io;
  
  import 'dart:convert';
  
  abstract class Directory implements FileSystemEntity {
    factory Directory(String path) {
      throw 0;
  