This issue was originally filed by @butlermatt

What steps will reproduce the problem?

1. Create a very simple Polymer element (or use default content)
2. Use the quick-assist for to/from Json.
3. Stagger.

What is the expected output? What do you see instead?
Expected:

   Map toJson() { return { "var1": var1, "var2" : var2 } }

Received:

  Map toJson() {
    return {'$' : $, 'ATTRIBUTE_NODE' : ATTRIBUTE_NODE, 'Address' : Address, 'CDATA_SECTION_NODE' : CDATA_SECTION_NODE, 'COMMENT_NODE' : COMMENT_NODE, 'DOCUMENT_FRAGMENT_NODE' : DOCUMENT_FRAGMENT_NODE, 'DOCUMENT_NODE' : DOCUMENT_NODE, 'DOCUMENT_TYPE_NODE' : DOCUMENT_TYPE_NODE, 'ELEMENT_NODE' : ELEMENT_NODE, 'ENTITY_NODE' : ENTITY_NODE, 'ENTITY_REFERENCE_NODE' : ENTITY_REFERENCE_NODE, 'NOTATION_NODE' : NOTATION_NODE, 'PROCESSING_INSTRUCTION_NODE' : PROCESSING_INSTRUCTION_NODE, 'TEXT_NODE' : TEXT_NODE, '_test' : _test, 'abortEvent' : abortEvent, 'beforeCopyEvent' : beforeCopyEvent, 'beforeCutEvent' : beforeCutEvent, 'beforePasteEvent' : beforePasteEvent, 'bindPattern' : bindPattern, 'blurEvent' : blurEvent, 'canPlayEvent' : canPlayEvent, 'canPlayThroughEvent' : canPlayThroughEvent, 'changeEvent' : changeEvent, 'clickEvent' : clickEvent, 'contentEditable' : contentEditable, 'contextMenuEvent' : contextMenuEvent, 'copyEvent' : copyEvent, 'cutEvent' : cutEvent, 'dir' : dir, 'doubleClickEvent' : doubleClickEvent, 'dragEndEvent' : dragEndEvent, 'dragEnterEvent' : dragEnterEvent, 'dragEvent' : dragEvent, 'dragLeaveEvent' : dragLeaveEvent, 'dragOverEvent' : dragOverEvent, 'dragStartEvent' : dragStartEvent, 'draggable' : draggable, 'dropEvent' : dropEvent, 'dropzone' : dropzone, 'durationChangeEvent' : durationChangeEvent, 'emptiedEvent' : emptiedEvent, 'endedEvent' : endedEvent, 'errorEvent' : errorEvent, 'focusEvent' : focusEvent, 'fullscreenChangeEvent' : fullscreenChangeEvent, 'fullscreenErrorEvent' : fullscreenErrorEvent, 'hidden' : hidden, 'inputEvent' : inputEvent, 'invalidEvent' : invalidEvent, 'keyDownEvent' : keyDownEvent, 'keyPressEvent' : keyPressEvent, 'keyUpEvent' : keyUpEvent, 'lang' : lang, 'loadEvent' : loadEvent, 'loadedDataEvent' : loadedDataEvent, 'loadedMetadataEvent' : loadedMetadataEvent, 'mouseDownEvent' : mouseDownEvent, 'mouseEnterEvent' : mouseEnterEvent, 'mouseLeaveEvent' : mouseLeaveEvent, 'mouseMoveEvent' : mouseMoveEvent, 'mouseOutEvent' : mouseOutEvent, 'mouseOverEvent' : mouseOverEvent, 'mouseUpEvent' : mouseUpEvent, 'mouseWheelEvent' : mouseWheelEvent, 'name' : name, 'notes' : notes, 'pasteEvent' : pasteEvent, 'pauseEvent' : pauseEvent, 'playEvent' : playEvent, 'playingEvent' : playingEvent, 'rateChangeEvent' : rateChangeEvent, 'resetEvent' : resetEvent, 'scrollEvent' : scrollEvent, 'searchEvent' : searchEvent, 'seekedEvent' : seekedEvent, 'seekingEvent' : seekingEvent, 'selectEvent' : selectEvent, 'selectStartEvent' : selectStartEvent, 'spellcheck' : spellcheck, 'stalledEvent' : stalledEvent, 'submitEvent' : submitEvent, 'suspendEvent' : suspendEvent, 'syntax' : syntax, 'tabIndex' : tabIndex, 'test' : test, 'timeUpdateEvent' : timeUpdateEvent, 'title' : title, 'touchCancelEvent' : touchCancelEvent, 'touchEndEvent' : touchEndEvent, 'touchEnterEvent' : touchEnterEvent, 'touchLeaveEvent' : touchLeaveEvent, 'touchMoveEvent' : touchMoveEvent, 'touchStartEvent' : touchStartEvent, 'transitionEndEvent' : transitionEndEvent, 'translate' : translate, 'veiledElements' : veiledElements, 'volumeChangeEvent' : volumeChangeEvent, 'waitingEvent' : waitingEvent};
  }

What version of the product are you using? On what operating system?
Dart Editor version 1.2.0.dev_01_00 (DEV)
Dart SDK version 1.2.0-dev.1.0
Linux 64-bit