37a58c918e
Assertion changed to handle empty tokens. getBeginToken() bugs fixed. getLibraryOrScriptName() added to LibraryElement. Optional uri argument added to spanFromNode. Committed: https://code.google.com/p/dart/source/detail?r=9160 Review URL: https://chromiumcodereview.appspot.com//10697003 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@9166 260f80e4-7a28-3924-810f-c04153c831b5