What steps will reproduce the problem?

1. https://github.com/danellis/minimaldartbug
2. pub build --mode=debug
3. pub serve
4. http://localhost:8080/index.html

What is the expected output? What do you see instead?
Resource interpreted as Script but transferred with MIME type application/dart: "http://localhost:8080/index.html_bootstrap.dart". index.html:8
warning: file:///home/dan/projects/confabulous/bug/web/index.html.0.dart library not found index.html_bootstrap.dart.js:15697
Uncaught Error: NoSuchMethodError: Cannot call "get$functions" on "#<JsLibraryMirror>" (Object #<JsLibraryMirror> has no method 'get$functions') index.html_bootstrap.dart.js:15697
Stack Trace:
TypeError: Object #<JsLibraryMirror> has no method 'get$functions'
    at dart._loadLibrary (http://localhost:8080/index.html_bootstrap.dart.js:17848:19)
    at dart._loadLibraries (http://localhost:8080/index.html_bootstrap.dart.js:17765:11)
    at dart._initPolymerOptimized (http://localhost:8080/index.html_bootstrap.dart.js:17756:7)
    at dart.initPolymer (http://localhost:8080/index.html_bootstrap.dart.js:17750:7)
    at main (http://localhost:8080/index.html_bootstrap.dart.js:4036:7)
    at _IsolateContext.eval$1 (http://localhost:8080/index.html_bootstrap.dart.js:1297:23)
    at dart.startRootIsolate (http://localhost:8080/index.html_bootstrap.dart.js:1073:21)
    at http://localhost:8080/index.html_bootstrap.dart.js:24119:7
    at init.currentScript (http://localhost:8080/index.html_bootstrap.dart.js:24099:5)
    at http://localhost:8080/index.html_bootstrap.dart.js:24113:3
 index.html_bootstrap.dart.js:15697
Uncaught NoSuchMethodError: Cannot call "get$functions" on "#<JsLibraryMirror>" (Object #<JsLibraryMirror> has no method 'get$functions') index.html_bootstrap.dart.js:2297

What version of the product are you using? On what operating system?
Dart 1.2.0, Polymer.dart 0.9.5

Please provide any additional information below.
This is happening even on early builds of my app that were working okay before. Although I'm developing in IntelliJ, the minimaldartbug repo above is a fresh repo created without any IDE interference.