Dart 在polymer|u代码段| web/index.html上转换聚合物（PolymerBotStrapTransformer）引发错误：意外关键字：as

我最近将我的Dart eclipse插件更新为当前的开发版本，现在我的应用程序将无法运行。我在尝试运行应用程序的index.html文件时遇到此错误

--- 5:27:22 PM Starting pub serve : polymer_snippet ---
Loading source assets...
Loading polymer and sass transformers...
Serving polymer_snippet web on http://localhost:8080
Build error:
Transform polymer (PolymerBootstrapTransformer) on polymer_snippet|web/index.html threw error: unexpected keyword: as
package:polymer_expressions/parser.dart 159                 Parser._parsePrimary
package:polymer_expressions/parser.dart 138                 Parser._parseUnary
package:polymer_expressions/parser.dart 106                 Parser._parseBinary
package:polymer_expressions/parser.dart 80                  Parser._parsePrecedence
package:polymer_expressions/parser.dart 46                  Parser._parseExpression
package:polymer_expressions/parser.dart 32                  Parser.parse
package:polymer_expressions/parser.dart 15                  parse
package:polymer/src/build/polymer_smoke_generator.dart 526  _HtmlExtractor._addExpression
package:polymer/src/build/polymer_smoke_generator.dart 461  _HtmlExtractor.visitText
package:html/dom_parsing.dart 15                            TreeVisitor.visit
package:html/dom_parsing.dart 31                            TreeVisitor.visitChildren
package:html/dom_parsing.dart 37                            TreeVisitor.visitNodeFallback
package:html/dom_parsing.dart 46                            TreeVisitor.visitElement
package:polymer/src/build/polymer_smoke_generator.dart 450  _HtmlExtractor.visitElement
package:html/dom_parsing.dart 13                            TreeVisitor.visit
package:html/dom_parsing.dart 31                            TreeVisitor.visitChildren
package:html/dom_parsing.dart 37                            TreeVisitor.visitNodeFallback
package:html/dom_parsing.dart 46                            TreeVisitor.visitElement
package:polymer/src/build/polymer_smoke_generator.dart 450  _HtmlExtractor.visitElement
package:html/dom_parsing.dart 13                            TreeVisitor.visit
package:html/dom_parsing.dart 31                            TreeVisitor.visitChildren
package:html/dom_parsing.dart 37                            TreeVisitor.visitNodeFallback
package:html/dom_parsing.dart 46                            TreeVisitor.visitElement
package:polymer/src/build/polymer_smoke_generator.dart 450  _HtmlExtractor.visitElement
package:html/dom_parsing.dart 13                            TreeVisitor.visit
package:html/dom_parsing.dart 31                            TreeVisitor.visitChildren
package:html/dom_parsing.dart 37                            TreeVisitor.visitNodeFallback
package:html/dom_parsing.dart 46                            TreeVisitor.visitElement
package:polymer/src/build/polymer_smoke_generator.dart 450  _HtmlExtractor.visitElement
package:html/dom_parsing.dart 13                            TreeVisitor.visit
package:html/dom_parsing.dart 31                            TreeVisitor.visitChildren
package:html/dom_parsing.dart 37                            TreeVisitor.visitNodeFallback
package:html/dom_parsing.dart 46                            TreeVisitor.visitElement
package:polymer/src/build/polymer_smoke_generator.dart 450  _HtmlExtractor.visitElement
package:html/dom_parsing.dart 13                            TreeVisitor.visit
package:html/dom_parsing.dart 31                            TreeVisitor.visitChildren
package:html/dom_parsing.dart 37                            TreeVisitor.visitNodeFallback
package:html/dom_parsing.dart 46                            TreeVisitor.visitElement
package:polymer/src/build/polymer_smoke_generator.dart 450  _HtmlExtractor.visitElement
package:html/dom_parsing.dart 13                            TreeVisitor.visit
package:html/dom_parsing.dart 31                            TreeVisitor.visitChildren
package:html/dom_parsing.dart 37                            TreeVisitor.visitNodeFallback
package:html/dom_parsing.dart 46                            TreeVisitor.visitElement
package:polymer/src/build/polymer_smoke_generator.dart 447  _HtmlExtractor.visitElement
package:html/dom_parsing.dart 13                            TreeVisitor.visit
package:html/dom_parsing.dart 31                            TreeVisitor.visitChildren
package:html/dom_parsing.dart 37                            TreeVisitor.visitNodeFallback
package:html/dom_parsing.dart 46                            TreeVisitor.visitElement
package:polymer/src/build/polymer_smoke_generator.dart 450  _HtmlExtractor.visitElement
package:html/dom_parsing.dart 13                            TreeVisitor.visit
package:html/dom_parsing.dart 31                            TreeVisitor.visitChildren
package:html/dom_parsing.dart 37                            TreeVisitor.visitNodeFallback
package:html/dom_parsing.dart 46                            TreeVisitor.visitElement
package:polymer/src/build/polymer_smoke_generator.dart 450  _HtmlExtractor.visitElement
package:html/dom_parsing.dart 13                            TreeVisitor.visit
package:html/dom_parsing.dart 31                            TreeVisitor.visitChildren
package:html/dom_parsing.dart 37                            TreeVisitor.visitNodeFallback
package:html/dom_parsing.dart 46                            TreeVisitor.visitElement
package:polymer/src/build/polymer_smoke_generator.dart 450  _HtmlExtractor.visitElement
package:html/dom_parsing.dart 13                            TreeVisitor.visit
package:html/dom_parsing.dart 31                            TreeVisitor.visitChildren
package:html/dom_parsing.dart 37                            TreeVisitor.visitNodeFallback
package:html/dom_parsing.dart 39                            TreeVisitor.visitDocument
package:html/dom_parsing.dart 21                            TreeVisitor.visit
package:polymer/src/build/polymer_smoke_generator.dart 169  PolymerSmokeGenerator._extractUsesOfMirrors.<fn>
dart:async/zone.dart 1155                                   _RootZone.runUnary
dart:async/future_impl.dart 494                             _Future._propagateToListeners.handleValueCallback
dart:async/future_impl.dart 577                             _Future._propagateToListeners
dart:async/future_impl.dart 358                             _Future._complete
dart:async/future.dart 364                                  Future.doWhile.<fn>
dart:async/zone.dart 1093                                   _RootZone.runUnaryGuarded
dart:async/zone.dart 1122                                   _RootZone.bindUnaryCallback.<fn>
dart:async/zone.dart 1155                                   _RootZone.runUnary
dart:async/future_impl.dart 494                             _Future._propagateToListeners.handleValueCallback
dart:async/future_impl.dart 577                             _Future._propagateToListeners
dart:async/future_impl.dart 368                             _Future._completeWithValue
dart:async/future_impl.dart 422                             _Future._asyncComplete.<fn>
dart:async/schedule_microtask.dart 41                       _asyncRunCallbackLoop
dart:async/schedule_microtask.dart 48                       _asyncRunCallback
dart:isolate-patch/isolate_patch.dart 96                    _runPendingImmediateCallback
dart:isolate-patch/isolate_patch.dart 143                   _RawReceivePortImpl._handleMessage

package:polymer_expressions/parser.dart 159                 Parser._parsePrimary
package:polymer_expressions/parser.dart 138                 Parser._parseUnary
package:polymer_expressions/parser.dart 106                 Parser._parseBinary
package:polymer_expressions/parser.dart 80                  Parser._parsePrecedence
package:polymer_expressions/parser.dart 46                  Parser._parseExpression
package:polymer_expressions/parser.dart 32                  Parser.parse
package:polymer_expressions/parser.dart 15                  parse
package:polymer/src/build/polymer_smoke_generator.dart 526  _HtmlExtractor._addExpression
package:polymer/src/build/polymer_smoke_generator.dart 461  _HtmlExtractor.visitText
package:html/dom_parsing.dart 15                            TreeVisitor.visit
package:html/dom_parsing.dart 31                            TreeVisitor.visitChildren
package:html/dom_parsing.dart 37                            TreeVisitor.visitNodeFallback
package:html/dom_parsing.dart 46                            TreeVisitor.visitElement
package:polymer/src/build/polymer_smoke_generator.dart 450  _HtmlExtractor.visitElement
package:html/dom_parsing.dart 13                            TreeVisitor.visit
package:html/dom_parsing.dart 31                            TreeVisitor.visitChildren
package:html/dom_parsing.dart 37                            TreeVisitor.visitNodeFallback
package:html/dom_parsing.dart 46                            TreeVisitor.visitElement
package:polymer/src/build/polymer_smoke_generator.dart 450  _HtmlExtractor.visitElement
package:html/dom_parsing.dart 13                            TreeVisitor.visit
package:html/dom_parsing.dart 31                            TreeVisitor.visitChildren
package:html/dom_parsing.dart 37                            TreeVisitor.visitNodeFallback
package:html/dom_parsing.dart 46                            TreeVisitor.visitElement
package:polymer/src/build/polymer_smoke_generator.dart 450  _HtmlExtractor.visitElement
package:html/dom_parsing.dart 13                            TreeVisitor.visit
package:html/dom_parsing.dart 31                            TreeVisitor.visitChildren
package:html/dom_parsing.dart 37                            TreeVisitor.visitNodeFallback
package:html/dom_parsing.dart 46                            TreeVisitor.visitElement
package:polymer/src/build/polymer_smoke_generator.dart 450  _HtmlExtractor.visitElement
package:html/dom_parsing.dart 13                            TreeVisitor.visit
package:html/dom_parsing.dart 31                            TreeVisitor.visitChildren
package:html/dom_parsing.dart 37                            TreeVisitor.visitNodeFallback
package:html/dom_parsing.dart 46                            TreeVisitor.visitElement
package:polymer/src/build/polymer_smoke_generator.dart 450  _HtmlExtractor.visitElement
package:html/dom_parsing.dart 13                            TreeVisitor.visit
package:html/dom_parsing.dart 31                            TreeVisitor.visitChildren
package:html/dom_parsing.dart 37                            TreeVisitor.visitNodeFallback
package:html/dom_parsing.dart 46                            TreeVisitor.visitElement
package:polymer/src/build/polymer_smoke_generator.dart 450  _HtmlExtractor.visitElement
package:html/dom_parsing.dart 13                            TreeVisitor.visit
package:html/dom_parsing.dart 31                            TreeVisitor.visitChildren
package:html/dom_parsing.dart 37                            TreeVisitor.visitNodeFallback
package:html/dom_parsing.dart 46                            TreeVisitor.visitElement
package:polymer/src/build/polymer_smoke_generator.dart 447  _HtmlExtractor.visitElement
package:html/dom_parsing.dart 13                            TreeVisitor.visit
package:html/dom_parsing.dart 31                            TreeVisitor.visitChildren
package:html/dom_parsing.dart 37                            TreeVisitor.visitNodeFallback
package:html/dom_parsing.dart 46                            TreeVisitor.visitElement
package:polymer/src/build/polymer_smoke_generator.dart 450  _HtmlExtractor.visitElement
package:html/dom_parsing.dart 13                            TreeVisitor.visit
package:html/dom_parsing.dart 31                            TreeVisitor.visitChildren
package:html/dom_parsing.dart 37                            TreeVisitor.visitNodeFallback
package:html/dom_parsing.dart 46                            TreeVisitor.visitElement
package:polymer/src/build/polymer_smoke_generator.dart 450  _HtmlExtractor.visitElement
package:html/dom_parsing.dart 13                            TreeVisitor.visit
package:html/dom_parsing.dart 31                            TreeVisitor.visitChildren
package:html/dom_parsing.dart 37                            TreeVisitor.visitNodeFallback
package:html/dom_parsing.dart 46                            TreeVisitor.visitElement
package:polymer/src/build/polymer_smoke_generator.dart 450  _HtmlExtractor.visitElement
package:html/dom_parsing.dart 13                            TreeVisitor.visit
package:html/dom_parsing.dart 31                            TreeVisitor.visitChildren
package:html/dom_parsing.dart 37                            TreeVisitor.visitNodeFallback
package:html/dom_parsing.dart 39                            TreeVisitor.visitDocument
package:html/dom_parsing.dart 21                            TreeVisitor.visit
package:polymer/src/build/polymer_smoke_generator.dart 169  PolymerSmokeGenerator._extractUsesOfMirrors.<fn>
dart:isolate                                                _RawReceivePortImpl._handleMessage
Build completed with 1 errors.
[web] GET /index.html => Could not find asset polymer_snippet|web/index.html.

---下午5:27:22开始酒吧服务：polymer\u片段---
正在加载源资产。。。
加载聚合物和sass变压器。。。
在web上提供代码段http://localhost:8080
生成错误：
在polymer|u代码段| web/index.html上转换聚合物（PolymerBotStrapTransformer）引发错误：意外关键字：as
包：polymer\u expressions/parser.dart 159 parser.\u parsePrimary
包：polymer_expressions/parser.dart 138 parser._parse1元
包：polymer_expressions/parser.dart 106 parser._parseBinary
包：polymer\u expressions/parser.dart 80 parser.\u parsepreference
包：polymer_expressions/parser.dart 46 parser._parseExpression
包：polymer_expressions/parser.dart 32 parser.parse
包：polymer_expressions/parser.dart 15 parse
包装：polymer/src/build/polymer\u smoke\u generator.dart 526\u HtmlExtractor.\u addExpression
包装：polymer/src/build/polymer\u smoke\u generator.dart 461\u HtmlExtractor.visitText
包：html/dom_parsing.dart 15 TreeVisitor.visit
包：html/dom_parsing.dart 31 TreeVisitor.visitChildren
包：html/dom_parsing.dart 37 TreeVisitor.visitNodeFallback
包：html/dom_parsing.dart 46 TreeVisitor.visitement
包装：polymer/src/build/polymer\u smoke\u generator.dart 450\u HtmlExtractor.visitElement
包：html/dom_parsing.dart 13 TreeVisitor.visit
包：html/dom_parsing.dart 31 TreeVisitor.visitChildren
包：html/dom_parsing.dart 37 TreeVisitor.visitNodeFallback
包：html/dom_parsing.dart 46 TreeVisitor.visitement
包装：polymer/src/build/polymer\u smoke\u generator.dart 450\u HtmlExtractor.visitElement
包：html/dom_parsing.dart 13 TreeVisitor.visit
包：html/dom_parsing.dart 31 TreeVisitor.visitChildren
包：html/dom_parsing.dart 37 TreeVisitor.visitNodeFallback
包：html/dom_parsing.dart 46 TreeVisitor.visitement
包装：polymer/src/build/polymer\u smoke\u generator.dart 450\u HtmlExtractor.visitElement
包：html/dom_parsing.dart 13 TreeVisitor.visit
包：html/dom_parsing.dart 31 TreeVisitor.visitChildren
包：html/dom_parsing.dart 37 TreeVisitor.visitNodeFallback
包：html/dom_parsing.dart 46 TreeVisitor.visitement
包装：polymer/src/build/polymer\u smoke\u generator.dart 450\u HtmlExtractor.visitElement
包：html/dom_parsing.dart 13 TreeVisitor.visit
包：html/dom_parsing.dart 31 TreeVisitor.visitChildren
包：html/dom_parsing.dart 37 TreeVisitor.visitNodeFallback
包：html/dom_parsing.dart 46 TreeVisitor.visitement
包装：polymer/src/build/polymer\u smoke\u generator.dart 450\u HtmlExtractor.visitElement
包：html/dom_parsing.dart 13 TreeVisitor.visit
包：html/dom_parsing.dart 31 TreeVisitor.visitChildren
包：html/dom_parsing.dart 37 TreeVisitor.visitNodeFallback
包：html/dom_parsing.dart 46 TreeVisitor.visitement
包装：polymer/src/build/polymer\u smoke\u generator.dart 450\u HtmlExtractor.visitElement
包：html/dom_parsing.dart 13 TreeVisitor.visit
包：html/dom_parsing.dart 31 TreeVisitor.visitChildren
包：html/dom_parsing.dart 37 TreeVisitor.visitNodeFallback
包：html/dom_parsing.dart 46 TreeVisitor.visitement
包装：polymer/src/build/polymer\u smoke\u generator.dart 447\u HtmlExtractor.visitElement
包：html/dom_parsing.dart 13 TreeVisitor.visit
包：html/dom_parsing.dart 31 TreeVisitor.visitChildren
包：html/dom_parsing.dart 37 TreeVisitor.visitNodeFallback
包：html/dom_parsing.dart 46 TreeVisitor.visitement
包装：polymer/src/build/polymer\u smoke\u generator.dart 450\u HtmlExtractor.visitElement
包：html/dom_parsing.dart 13 TreeVisitor.visit
包：html/dom_parsing.dart 31 TreeVisitor.visitChildren
包：html/dom_parsing.dart 37 TreeVisitor.visitNodeFallback
包：html/dom_parsing.dart 46 TreeVisitor.visitement
包装：polymer/src/build/polymer\u smoke\u generator.dart 450\u HtmlExtractor.visitElement
包：html/dom_parsing.dart 13 TreeVisitor.visit
包：html/dom_parsing.dart 31 TreeVisitor.visitChildren
包：html/dom_parsing.dart 37 TreeVisitor.visitNodeFallback
包：html/dom_parsing.dart 46 TreeVisitor.visitement
包装：polymer/src/build/polymer\u smoke\u generator.dart 450\u HtmlExtractor.visitElement
包：html/dom_parsing.dart 13 TreeVisitor.visit
包：html/dom_parsing.dart 31 TreeVisitor.visitChildren
包：html/dom_parsing.dart 37 TreeVisitor.visitNodeFallback
包：html/dom_parsing.dart 39 TreeVisitor.visitDocument
包：html/dom_.dart 21